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From Wikipedia, the free encyclopedia
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There are a number of different interpretations for "easternmost" and "westernmost"; see below for full treatment.

This is a list of the extreme points of the United States, 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.

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
Extreme points of the U.S. on the North American continent: Point Barrow, Cape Sable, West Quoddy Head, Cape Prince of Wales
Extreme points in all U.S. territory: Point Barrow, Rose Atoll, Wake Island, Peaked Island (red dots); Point Udall, Guam, and Point Udall, USVI are shown as green dots. The International Date Line is shown in yellow.

Northernmost points[edit]

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]

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]

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]

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.[4]

Highest points[edit]

Lowest points[edit]

Other points[edit]

Islands[edit]

Lakes[edit]

Rivers[edit]

Extremes in distance[edit]

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]

  1. ^ International Boundary Commission
  2. ^ http://www.quoddyloop.com/ep.shtml
  3. ^ The Milepost 61st edition pg. 626 ISBN 978-1892-15426-2
  4. ^ 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. 
  5. ^ The summit of Mount McKinley is the highest point of the Alaska Range, the State of Alaska, the United States of America, and all of greater North America. Mount McKinley is the third most prominent summit on earth.
  6. ^ "Mount McKinley". Summits of the World. peakbagger.com. Retrieved September 8, 2012. 
  7. ^ The summit of Mount Whitney is the highest point of the Sierra Nevada, the State of California, and the contiguous United States.
  8. ^ "Mount Whitney". NGS Station Datasheet. United States National Geodetic Survey. Retrieved September 9, 2012. 
  9. ^ "Mount Whitney". Summits of the World. peakbagger.com. Retrieved September 9, 2012. 
  10. ^ The summit elevation of Mount Whitney includes an adjustment of +1.869 m (+6.1 ft) from NGVD 29 to NAVD 88.
  11. ^ The summit of Grays Peak is the highest point of the Front Range and the Continental Divide of North America.
  12. ^ "Grays Peak". NGS Station Datasheet. United States National Geodetic Survey. Retrieved September 8, 2012. 
  13. ^ "Grays Peak". Summits of the World. peakbagger.com. Retrieved September 8, 2012. 
  14. ^ The summit elevation of Grays Peak includes an adjustment of +1.881 m (+6.2 ft) from NGVD 29 to NAVD 88.
  15. ^ The summit of Mauna Kea is the highest point of the Island of Hawaiʻi, the State of Hawaiʻi, and the entire Pacific Ocean. Mauna Kea is also the tallest mountain on Earth as measured from base to summit. The shield volcano sits on the ocean floor at a depth of 5,998 meters (19,678 ft) for a total height of 10,203 meters (33,474 ft).
  16. ^ "Mauna Kea". Summits of the World. peakbagger.com. Retrieved April 1, 2012. 
  17. ^ "About Taos Ski Valley". Taos Ski Valley Chamber of Commerce. Retrieved 2012-02-29. 
  18. ^ 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.
  19. ^ 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
  20. ^ 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.
  21. ^ "Baker Island". Geographic Names Information System. United States Geological Survey. Retrieved 2009-02-24. 
  22. ^ "State University Encyclopedia: Equator". State University Encyclopedia. Retrieved 2009-07-03. 
  23. ^ "CIA World Factbook: Jarvis Island". CIA World Factbook. Retrieved 2009-07-03. 
  24. ^ 2009 Crater Lake National Park map
  25. ^ http://geography.howstuffworks.com/united-states/geography-of-united-states1.htm
  26. ^ a b c d e http://egsc.usgs.gov/isb/pubs/booklets/elvadist/elvadist.html#Extreme

External links[edit]

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