The Moscow Metro (Russian: Моско́вский метрополите́н, tr. Moskovsky metropoliten, IPA: [mɐˈskofskʲɪj mʲɪtrəpəlʲɪˈtɛn]) is a rapid transit system serving Moscow, Russia and the neighbouring Moscow Oblast towns of Krasnogorsk and Reutov. Opened in 1935 with one 11-kilometre (6.8 mi) line and 13 stations, it was the first underground railway system in the Soviet Union. As of 2014, the Moscow Metro has 194 stations and its route length is 325.4 km (202.2 mi). The system is mostly underground, with the deepest section 74 metres (243 ft) at the Park Pobedy station. The Moscow Metro was the world's second most heavily used rapid transit system in 2012 after Seoul Metropolitan Subway.