There are a number of different interpretations for "easternmost" and "westernmost"; see
for full treatment.
This is a list of the
extreme points of the , the points that are farther north, south, east, or west than any other location in the country. Also included are extreme points in elevation, extreme distances, and other points of peculiar geographic interest. United States
Extreme points in the 50 states: Point Barrow, Ka Lae, Sail Rock, Peaked Island
Extreme points in the contiguous 48 states: Northwest Angle, Ballast Key, Sail Rock, Bodelteh Islands. See text for discussion about distortion in this non-cylindrical map.
Extreme points of the U.S. on the North American continent: Point Barrow, Cape Sable, West Quoddy Head, Cape Prince of Wales
Northernmost points [ edit ]
Point Barrow, Alaska – northernmost point in all 71°23′20″N 156°28′45″W / 71.38889°N 156.47917°W U.S. territory
Barrow, Alaska – northernmost incorporated place in all U.S. territory, population about 4,000 71°17′44″N 156°45′59″W / 71.29556°N 156.76639°W
Fairbanks, Alaska – northernmost city of more than 20,000 residents, and northernmost city with public road access 64°50′22.94″N 147°43′14.63″W / 64.8397056°N 147.7207306°W
Anchorage, Alaska – northernmost city of more than 250,000 residents 61°13′4.17″N 149°53′33.17″W / 61.2178250°N 149.8925472°W
Northwest Angle Inlet in Lake of the Woods, Minnesota – northernmost point in the 48 49°23′04.1″N 95°9′12.2″W / 49.384472°N 95.153389°W contiguous states (because of incomplete information at the time of the Treaty of Paris (1783) settling the American Revolutionary War)
Sumas, Washington – northernmost incorporated place in the 48 contiguous states (because of 19th century survey inaccuracy placing the international border slightly north of the 49°00′08.6″N 122°15′40″W / 49.002389°N 122.26111°W 49th parallel here. ) 
Bellingham, Washington – northernmost city of more than 50,000 residents in the 48 contiguous states 48°45′19.12″N 122°28′43.54″W / 48.7553111°N 122.4787611°W
Seattle, Washington – northernmost city of more than 500,000 residents in the United States 47°36′13.81″N 122°19′48.56″W / 47.6038361°N 122.3301556°W
Alaska has the northernmost geographic center of all the states. North Dakota has the northernmost geographic center of the 48 contiguous states.
Note that maps of the 48 states that are displayed in a non-cylindrical projection (i.e. curved lines of latitude) can give the impression that the state of Maine extends farther north than it actually does. The northernmost point in Maine is at approximately 47.46 degrees North latitude. This line of latitude passes through the southern suburbs of Seattle. From there, it is approximately 100 miles (160 km) north to the 49th parallel. A wide swath of land within the 48 states (encompassing portions of Washington, Idaho, Montana, North Dakota, and Minnesota) is therefore farther north than any place in Maine. Included in this area are such places as Spokane, Washington; Coeur d'Alene, Idaho; Great Falls, Montana; Minot and Grand Forks, North Dakota; and Bemidji, Minnesota. Even Isle Royale and parts of the Upper Peninsula of Michigan (such as the Keweenaw Peninsula) are farther north than anywhere in Maine. By comparison, the southernmost land in Canada, Middle Island, Ontario, at a latitude of North 41°40'53", lies entirely south of 12 of the contiguous states - Washington, Idaho, Minnesota, Montana, North Dakota, Michigan, Maine, Wisconsin, Oregon, South Dakota, New Hampshire and Vermont - and south of the northernmost border of 14 more of the contiguous states.
Southernmost points [ edit ]
Amundsen–Scott South Pole Station, Antarctica ( ) – southernmost point under United States jurisdiction 90°0′0″S 0°0′0″E / 90.00000°S 0.00000°E
Rose Atoll, American Samoa ( ) – southernmost point in all U.S.-controlled territory 14°34′11″S 168°9′10″W / 14.56972°S 168.15278°W
Palmyra Atoll - southernmost point in all U.S. incorporated territory
Ka Lae, Hawaii ( ) – southernmost point in the 50 states 18°54′39″N 155°40′52″W / 18.91083°N 155.68111°W
Nā'ālehu, Hawaii ( ) – southernmost town in the 50 states 19°3′57″N 155°35′15″W / 19.06583°N 155.58750°W
Hilo, Hawaii ( ) - southernmost place with a population over 25,000 in the 50 states 19°41′58″N 155°4′51″W / 19.69944°N 155.08083°W
City and County of Honolulu, Hawaii – southernmost incorporated place in the 50 states (Hawaii's only incorporated place) Western Dry Rocks,
Florida ( ) – In the 24°26.8′N 81°55.6′W / 24.4467°N 81.9267°W Florida Keys - southernmost point in the 48 contiguous states occasionally above water at low tide
Ballast Key, Florida ( ) – southernmost point in the 48 contiguous states continuously above water 24°31′15″N 81°57′49″W / 24.52083°N 81.96361°W
Key West, Florida ( ) – southernmost incorporated place in the contiguous 48 states 24°32′38.724″N 81°48′17.658″W / 24.54409000°N 81.80490500°W
Cape Sable, Florida ( ) – southernmost point on the U.S. mainland 25°7′6″N 81°5′11″W / 25.11833°N 81.08639°W
Miami, Florida – the southernmost major metropolitan city in the 48 contiguous states
Cameron County, Texas – Southernmost point on the 25°50′14.5″N 97°23′39.9″W / 25.837361°N 97.394417°W Mexico–United States border.
Hawaii has the southernmost geographic center of all the states. Florida has the southernmost geographic center of the 48 contiguous states.
Note that maps of the 48 states that are displayed in an equal-area projection can give the impression that the state of Texas extends farther south than it actually does. The southernmost point in Texas (just southeast of Brownsville) is at approximately 25.50 degrees North latitude. This line of latitude passes through Hialeah, Florida, which is slightly north of Miami.
Easternmost points [ edit ]
Point Udall, St. Croix, U.S. Virgin Islands – easternmost point in all U.S. territory, by direction of travel 17°45′19″N 64°33′54″W / 17.75528°N 64.56500°W
Christiansted, United States Virgin Islands – easternmost town in all US territory, by direction of travel 17°44′54″N 64°43′00″W / 17.7482°N 64.7168°W Sail Rock
, just offshore of 44°48′45.2″N 66°56′49.3″W / 44.812556°N 66.947028°W West Quoddy Head, Maine – easternmost point in the 50 states, by direction of travel
West Quoddy Head, Maine – easternmost point on the U.S. mainland 44°48′55.4″N 66°56′59.2″W / 44.815389°N 66.949778°W
Lubec, Maine – easternmost incorporated place in the 50 states 44°49′03″N 66°57′00″W / 44.817419°N 66.949895°W
Eastport, Maine – easternmost incorporated city in the 50 states 
Calais, Maine – easternmost city of more than 2,500 residents in the 50 states
Houlton, Maine – easternmost city of more than 5,000 residents in the 50 states
Bangor, Maine – easternmost city of more than 20,000 residents in the 50 states
Portland, Maine – easternmost city of more than 50,000 residents in the 50 states
Boston, Massachusetts – easternmost major U.S. city (more than 500,000 residents) Pochnoi Point,
Semisopochnoi Island, Alaska – easternmost point in all U.S. territory by longitude—ironically, in the Alaskan 51°57′42″N 179°46′23″E / 51.96167°N 179.77306°E Aleutian Islands "west" of the westernmost point in the U.S. by longitude ( Amatignak Island) due to interposition of 180° longitude, which conventionally divides "west" from "east" in geographic terms. Peacock Point,
Wake Island – first sunrise (at 19°16′13.2″N 166°39′26.3″E / 19.270333°N 166.657306°E equinox) in all U.S. territory
Northern Islands Municipality, Northern Mariana Islands – easternmost municipality in all U.S. territory, by longitude 16°01′38″N 146°03′52″E / 16.0271°N 146.0645°E
Maine has the easternmost geographic center out of the 50 states.
Note that maps of the 48 states that are displayed in an equal-area projection can give the impression that the state of Florida extends farther east than it actually does. The easternmost point in Florida (Palm Beach Shores) is at approximately 80.03 degrees West longitude. This line of longitude passes through (or near) such places as Charleston, South Carolina; High Point, North Carolina; Salem, Virginia; Morgantown, West Virginia; and Pittsburgh and Erie, Pennsylvania – farther west than all of New York, New Jersey, Maryland, Delaware, and all of the New England states.
Westernmost points [ edit ]
Point Udall, Guam ( ) – westernmost point in all U.S. territory, by direction of travel 13°26′51″N 144°37′5.5″E / 13.44750°N 144.618194°E Peaked Island, offshore from
Cape Wrangell, Attu Island, Alaska – westernmost point in the 50 states by direction of travel, and last sunset (at 52°55′14″N 172°26′16″E / 52.92056°N 172.43778°E equinox) in all U.S. territory. West of it passes the International Date Line, after which come Russian territorial islands
Amatignak Island, Alaska – technically, westernmost point in all of U.S. territory by longitude, but not the westernmost of the U.S. 51°16′7″N 179°8′55″W / 51.26861°N 179.14861°W Aleutian Islands. It possesses the highest longitude west figure (179°8'55"W) before 180° longitude, which passes west of it. After 180°, longitude is termed "east" and declines numerically.
Adak, Alaska – westernmost incorporated city in the 50 states 51°49′21″N 176°42′53″W / 51.8224°N 176.7147°W
Unalaska, Alaska - westernmost city of more than 2,500 residents in the 50 states 53°53′20″N 166°31′38″W / 53.888984°N 166.527239°W
Cape Prince of Wales, Alaska – westernmost point on the 65°38′32″N 168°7′8″W / 65.64222°N 168.11889°W North American continent
Anchor Point, Alaska ( ) – Westernmost point on the continuous road system of North America 59°46′20.8914″N 151°52′2.373″W / 59.772469833°N 151.86732583°W  Umatilla Reef, offshore from
Cape Alava, Washington ( ) – westernmost point in the 48 contiguous states occasionally above water at low tide 48°11.1′N 124°47.1′W / 48.1850°N 124.7850°W Bodelteh Islands, offshore from
Cape Alava, Washington – westernmost point in the 48 contiguous states continuously above water 48°10′42.7″N 124°46′18.1″W / 48.178528°N 124.771694°W
Cape Alava, Washington ( ) – westernmost point on the U.S. mainland (contiguous) 48°9′51″N 124°43′59″W / 48.16417°N 124.73306°W
Ozette, Washington – westernmost town in the 48 contiguous states 48°09′17″N 124°40′02″W / 48.154722°N 124.667222°W
Port Orford, Oregon – westernmost incorporated place in the 48 contiguous states 42°45′15″N 124°30′45″W / 42.754065°N 124.512605°W
Brookings, Oregon – westernmost city of more than 5,000 residents in the 48 contiguous states
Eureka, California – westernmost city of more than 25,000 residents in the 48 contiguous states
Corvallis, Oregon – westernmost city of more than 50,000 residents in the 48 contiguous states
Eugene, Oregon – westernmost city of more than 100,000 residents in the 48 contiguous states
Portland, Oregon – westernmost city of more than 500,000 residents in the 48 contiguous states
Hawaii has the westernmost geographic center of all the states. Oregon has the westernmost geographic center of the 48 contiguous states.
Note that maps of the 48 states that are displayed in an equal-area projection can give the impression that the state of California extends farther west than it actually does. The westernmost point in California (Cape Mendocino) is approximately seven miles east of the westernmost point in Oregon (Cape Blanco), and approximately 14 miles (23 km) east of the westernmost point in Washington (Cape Alava).
Interpretation of easternmost and westernmost [ edit ]
There are three methods for reckoning the eastern and western extremes of the United States.
One method is to use the
Prime Meridian as the dividing line between east and west. This meridian running through Greenwich, London, is defined as zero degrees longitude and could be called the least eastern and least western place in the world. The 180th meridian, on the opposite side of the globe, is therefore the easternmost and westernmost place in the world.
Another method is to use the
International Date Line as the easternmost–westernmost extreme. On the equinox, the easternmost place would be where the day first begins, and the westernmost is where the day last ends.
Still another method is to first determine the geographic center of the country and from there measure the shortest distance to every other point. All U.S. territory is spread across less than 180° of longitude, so from any spot in the U.S. it is more direct to reach Point Udall, U.S. Virgin Islands, by traveling east than by traveling west. Likewise, there is not a single point in U.S. territory from which heading east is a shorter route to Point Udall, Guam, than heading west would be, even accounting for circumpolar routes. The two Udalls for whom the two Points are named were brothers,
Mo Udall in Guam and Stewart Udall in the Virgin Islands. 
Highest points [ edit ]
Denali ( Mount McKinley), Alaska, United States – highest summit in the United States, all US territories, and 63°4′9″N 151°0′23″W / 63.06917°N 151.00639°W North America at 20,310 feet (6,190.5 m) 
Mount Whitney, [note 1]    California – highest point in the 36°34′43″N 118°17′31″W / 36.57861°N 118.29194°W 48 contiguous states at 14,505 feet (4,421 m)
Grays Peak, [note 2]    Colorado, United States – highest point on the 39°38′2″N 105°49′3″W / 39.63389°N 105.81750°W Continental Divide of North America at 14,278 feet (4,352 m)
Mauna Kea, [note 3]  Hawai ʻi – highest island summit in all U.S. territory and the entire 19°49′14″N 155°28′5″W / 19.82056°N 155.46806°W Pacific Ocean at 13,796 feet (4,205 m)
Taos Ski Valley, New Mexico – highest village limits in all U.S. territory at 12,581 feet (3,835 m) (No residents of Taos Ski Valley live above 10,350 feet (3,150 m)) 36°35′52″N 105°26′42″W / 36.59778°N 105.44500°W 
Winter Park, Colorado – highest city limits in all U.S. territory at 12,060 feet (3,680 m) (No residents of Winter Park live above 9,550 feet (2,910 m)) 39°53′34″N 105°45′43″W / 39.89278°N 105.76194°W
San Juan County, Colorado – highest 37°49′N 107°40′W / 37.817°N 107.667°W U.S. county based on a mean elevation (11,240 feet (3,430 m))
Alma, Colorado – highest town in all U.S. territory at 10,355 feet (3,156 m); contiguous residential areas extend to 11,680 feet (3,560 m). 39°17′2″N 106°3′46″W / 39.28389°N 106.06278°W
Leadville, Colorado – highest city in all U.S. territory at 10,152 feet (3,094 m). (No residents of Leadville live above 10,360 feet (3,160 m)) 39°14′50″N 106°17′30″W / 39.24722°N 106.29167°W
Lake County Airport, Colorado – highest airfield in all U.S. territory and North America at 9,927 feet (3,026 m) 39°13′13″N 106°19′00″W / 39.22028°N 106.31667°W
New Mexico State Capitol, Santa Fe – highest 35°40′56″N 105°56′23″W / 35.68222°N 105.93972°W state capitol in the United States at 7,005 feet (2,135 m)
State of Colorado – highest 39°00′N 105°30′W / 39.000°N 105.500°W U.S. state based on an average elevation of 6,800 feet (2,100 m)
Mount Mitchell, North Carolina – highest point in eastern United States at 6,684 feet (2,037 m) 35°45′53″N 82°15′54″W / 35.76472°N 82.26500°W
Mount Washington, New Hampshire – highest point in northeastern United States at 6,288 feet (1,917 m) 44°16′13″N 71°18′12″W / 44.27028°N 71.30333°W
Arikaree River, Yuma County, Colorado at Kansas state line – highest 39°58′42″N 102°3′6″W / 39.97833°N 102.05167°W U.S. state low point at 3,317 feet (1,011 m)
Beech Mountain, North Carolina is the highest incorporated community at an elevation of 5,506 feet (1,678 m) east of the 36°12′23″N 81°52′59″W / 36.20639°N 81.88306°W Mississippi River.
Boone, North Carolina has the highest elevation (3,333 feet, 1015.9 m) of any town of its size (over 10,000 population) east of the Mississippi River. 36°12′41″N 81°40′7″W / 36.21139°N 81.66861°W
Eisenhower Tunnel west of Denver, Colorado is the highest point on the Interstate Highway System at 11,158 feet.
Lowest points [ edit ]
Badwater Basin, Death Valley, California – lowest surface point in all U.S. territory and North America at −279 feet (−85 m) 36°14′23″N 116°50′5″W / 36.23972°N 116.83472°W 
Salton Sea, California – lowest lake in all U.S. territory and North America at −226 feet (−69 m) 33°19′59″N 115°50′3″W / 33.33306°N 115.83417°W
Furnace Creek Airport, California – lowest airfield in all U.S. territory and Western Hemisphere at −210 feet (−64 m) 36°27′50″N 116°52′53″W / 36.46389°N 116.88139°W
Furnace Creek, California  – lowest settlement in all U.S. territory and Western Hemisphere at −190 feet (−58 m) 36°27′29″N 116°52′15″W / 36.45806°N 116.87083°W
Calipatria, California – lowest city in all U.S. territory and Western Hemisphere at −184 feet (−56 m) 33°07′32″N 115°30′51″W / 33.12556°N 115.51417°W
Ninth Ward of New Orleans, Louisiana – lowest surface point in eastern United States at −7 feet (−2.1 m) 30°02′40″N 89°56′47″W / 30.04444°N 89.94639°W
New Orleans, Louisiana – lowest city over 250,000 population in all U.S. territory and Western Hemisphere with an average elevation of −1.5 feet (−0.46 m) 29°58′N 90°03′W / 29.967°N 90.050°W
State of Delaware – lowest 39°0′17″N 75°32′46″W / 39.00472°N 75.54611°W U.S. state with an average elevation of 60 feet (18 m)
Britton Hill, Florida – lowest 30°59′18″N 86°16′55″W / 30.98833°N 86.28194°W U.S. state high point at 345 feet (105 m)
Lake Superior bottom, Michigan – lowest fresh water point in all U.S. territory at −732 feet (−223 m) 46°54′31″N 86°35′52″W / 46.90861°N 86.59778°W 
Puget Sound bottom, Washington – lowest sea water point in the interior of the United States at −956 feet (−291 m) 47°44.9′N 122°25.7′W / 47.7483°N 122.4283°W 
Other points [ edit ]
Most remote point in the 50 states: Ipnavik River,
National Petroleum Reserve–Alaska, ; 120 miles (190 km) from nearest habitation 68°45′N 156°41′W / 68.750°N 156.683°W
Geographic center of the 50 states: approximately 20 miles (32 km) north of Belle Fourche, South Dakota, 44°58′N 103°46′W / 44.967°N 103.767°W
Geographic center of the 48 contiguous states: approximately 4 miles (6.4 km) west of Lebanon, Kansas, 39°50′N 98°35′W / 39.833°N 98.583°W Closest to the equator:
Baker Island is located at . 0°11′41″N 176°28′46″W / 0.19472°N 176.47944°W    The
geographic center of the North American continent is located at , about 6 miles (10 km) west of 48°10′N 100°10′W / 48.167°N 100.167°W Balta in Pierce County, North Dakota.  The North American
pole of inaccessibility is located at , about eleven miles (18 km) south-east of the town of 43°22′N 101°58′W / 43.367°N 101.967°W Kyle on the Pine Ridge Indian Reservation in Bennett County, South Dakota, 1,025 miles (1,650 km) from the nearest coastlines.
Islands [ edit ]
Island of Hawai, ʻi Hawai ʻi – most extensive island in all U.S. territory at 4,028 square miles (10,430 km 19°49′15″N 155°28′5″W / 19.82083°N 155.46806°W 2) and tallest island in all U.S. territory and the entire Pacific Ocean at 13,796 feet (4,205 m)
Kodiak Island, Alaska – most extensive 57°28′N 153°26′W / 57.467°N 153.433°W Gulf of Alaska island at 3,595.09 square miles (9,311.2 km 2)
Island of Puerto Rico, Puerto Rico – most extensive island of U.S. 18°15′N 66°30′W / 18.250°N 66.500°W Caribbean territory at 3,515.1 square miles (9,104 km 2)
Prince of Wales Island, Alaska – most extensive island of the 55°37′55″N 132°54′27″W / 55.63194°N 132.90750°W Alexander Archipelago at 2,577 square miles (6,670 km 2)
Saint Lawrence Island, Alaska – most extensive 63°24′54″N 170°23′58″W / 63.41500°N 170.39944°W Bering Sea island at 1,791.56 square miles (4,640.1 km 2)
Unimak Island, Alaska – most extensive 54°46′6″N 164°11′12″W / 54.76833°N 164.18667°W Aleutian island at 1,571.41 square miles (4,069.9 km 2)
Long Island, New York – most extensive island of the U.S. 26°50′40″N 97°22′04″W / 26.84444°N 97.36778°W Atlantic coast at 1,401 square miles (3,630 km 2)
Padre Island, Texas – most extensive 26°50′40″N 97°22′04″W / 26.84444°N 97.36778°W Gulf of Mexico island at 209 square miles (540 km 2) and longest barrier island on Earth at 113 miles (182 km)
Isle Royale in Lake Superior, Michigan – most extensive island in a lake in all U.S. territory at 206.73 square miles (535.4 km 48°0′N 88°55′W / 48.000°N 88.917°W 2)
Whidbey Island, Washington – most extensive island of 48°8′11″N 122°34′57″W / 48.13639°N 122.58250°W Puget Sound at 168.67 square miles (436.9 km 2)
Santa Cruz Island, California – most extensive of the 34°0′13″N 119°43′35″W / 34.00361°N 119.72639°W Channel Islands of California at 97 square miles (250 km 2)
Lake Superior – largest freshwater lake in the world by surface area, at 31,700 square miles (82,000 km 47°45′N 87°30′W / 47.750°N 87.500°W 2), most voluminous freshwater lake in the United States at 2,900 cubic miles (12,000 km 3).
Great Salt Lake, Utah – most extensive 41°10′N 112°35′W / 41.167°N 112.583°W endorheic lake at 1,700 square miles (4,400 km 2)
Crater Lake, Oregon – deepest lake at 1,943 feet (592 m) 42°57′N 122°5′W / 42.950°N 122.083°W 
Mississippi River – most extensive 29°9′4″N 89°15′12″W / 29.15111°N 89.25333°W river basin at 1,151,000 square miles (2,980,000 km 2)
Mississippi- Missouri- Jefferson Rivers – longest 29°9′4″N 89°15′12″W / 29.15111°N 89.25333°W river system at 3,902 miles (6,280 km)
Missouri River – longest 38°48′49″N 90°7′11″W / 38.81361°N 90.11972°W main stem river at 2,341 miles (3,767 km)
Mississippi River – longest 29°9′4″N 89°15′12″W / 29.15111°N 89.25333°W Gulf of Mexico main stem river at 2,202 miles (3,544 km)
Yukon River – longest 62°35′55″N 164°47′40″W / 62.59861°N 164.79444°W Bering Sea main stem river at 1,979 miles (3,185 km)
Colorado River – longest 31°48′57″N 114°48′22″W / 31.81583°N 114.80611°W Gulf of California main stem river at 1,450 miles (2,330 km)
Columbia River – longest 46°14′39″N 124°3′29″W / 46.24417°N 124.05806°W Pacific Ocean main stem river at 1,243 miles (2,000 km)
Saint Lawrence River – longest 49°40′N 64°30′W / 49.667°N 64.500°W Atlantic Ocean main stem river at 600 miles (970 km)
Bear River – longest 41°27′30″N 112°17′25″W / 41.45833°N 112.29028°W endorheic basin main stem river at 491 miles (790 km)
Extremes in distance [ edit ]
Greatest east-west distance in the 48 contiguous states: 2,800 miles (4,500 km)
Greatest north-south distance in the 48 contiguous states: 1,650 miles (2,660 km).
 Greatest distance between any two points within U.S. Territory: 9,514 miles (15,311 km) from
Point Udall, Guam to Point Udall, St. Croix, U.S. Virgin Islands (formerly known as Orote Point and East Point, respectively).  Greatest distance between any two points within the 50 states: 5,859 miles (9,429 km) from
Kure Atoll, Hawaii to Log Point, Elliott Key, Florida.  Greatest distance between any two points within the contiguous 48 states: 2,901 miles (4,669 km) from
North Farallon Island, California to Sail Rock, east of West Quoddy Head, Maine.  Greatest distance between any two mainland points within the contiguous 48 states: 2,892 miles (4,654 km) from
Point Arena, California to West Quoddy Head, Maine.  Greatest distance between two points on the same latitude: 5,823 miles (9,371 km) from
Kure Atoll, Hawaii to Riviera Beach, Florida. 
Note that some map projections make diagonal lines appear longer than they actually are. However, the diagonal line from Kure Atoll, Hawaii to West Quoddy Head, Maine is only 5,797 miles (9,329 km) and the diagonal from Cape Wrangell, Attu Island, Alaska to Log Point on Elliott Key, Florida is only 5,505 miles (8,859 km).
See also [ edit ]
References [ edit ]
^ International Boundary Commission
^ The Milepost 61st edition pg. 626 ISBN 978-1892-15426-2
^ Donald Winslow Carson; James W. Johnson (2001). Life and times of Morris K. Udall. University of Arizona Press. p. 220. ISBN 0-8165-2049-6.
^ Mark Newell; Blaine Horner (September 2, 2015). "New Elevation for Nation's Highest Peak" (Press release). USGS . Retrieved . September 26, 2015
^ "Mount Whitney". NGS Station Datasheet. United States National Geodetic Survey . Retrieved . September 9, 2012
^ "Mount Whitney". Summits of the World. peakbagger.com . Retrieved . September 9, 2012
^ The summit elevation of Mount Whitney includes an adjustment of +1.869 m (+6.1 ft) from NGVD 29 to NAVD 88.
^ "Grays Peak". NGS Station Datasheet. United States National Geodetic Survey . Retrieved . September 8, 2012
^ "Grays Peak". Summits of the World. peakbagger.com . Retrieved . September 8, 2012
^ The summit elevation of Grays Peak includes an adjustment of +1.881 m (+6.2 ft) from NGVD 29 to NAVD 88.
^ "Mauna Kea". Summits of the World. peakbagger.com . Retrieved . April 1, 2012
^ "About Taos Ski Valley". Taos Ski Valley Chamber of Commerce . Retrieved . February 29, 2012
^ "USGS National Elevation Dataset (NED) 1 meter Downloadable Data Collection from The National Map 3D Elevation Program (3DEP) - National Geospatial Data Asset (NGDA) National Elevation Data Set (NED)". United States Geological Survey. September 21, 2015 . Retrieved . September 22, 2015
^ Furnace Creek, in Death Valley, California, set the world record for the highest reliably reported ambient air temperature of 134 °F (57 °C) on July 10, 1913. This record has been eclipsed only once by a questionable reading of 136 °F (58 °C) recorded in 'Aziziya, Libya, on September 13, 1922.
^ Sounding at 46° 54' 31"N, 86° 35' 52"W on NOAA chart 14963, Grand Marais to Big Bay Point, scale 1:120,000, 2006. Chart datum (as shown on the chart) is 601.1 feet above mean sea level at Rimouski, Quebec
^ Two identical soundings at 47° 45.2'N, 122° 26.0'W and 47° 44.6'N, 122° 25.4'W on NOAA chart 18446, Puget Sound: Apple Cove Point to Keyport, scale 1:25,000, 2005. Chart datum (as shown on the chart) is lower low water.
^ "Baker Island". . Geographic Names Information System United States Geological Survey . Retrieved . February 24, 2009
^ "State University Encyclopedia: Equator". State University Encyclopedia . Retrieved . July 3, 2009
^ "CIA World Factbook: Jarvis Island". CIA World Factbook . Retrieved . July 3, 2009
^ 2009 Crater Lake National Park map
^ a b c d e http://egsc.usgs.gov/isb/pubs/booklets/elvadist/elvadist.html#Extreme
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