The Moscow Metro 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 195 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) underground at the Park Pobedy station, one of the world's deepest. As of 2013, the Moscow Metro is the busiest metro system outside of Asia, the world's busiest by daily ridership and the 6th longest in the world. Daily ridership of seven million passengers rises on weekdays to over nine million.