Lefortovo Tunnel (Russian: Лефо́ртовский тоннель) is a road tunnel in the Lefortovo District in Moscow, Russia, opened in 2003. It carries seven lanes of the Third Ring Road. At 3.2 km (2.0 mi) long, it is the fourth longest in-city tunnel of Europe (after the M30 RingRoad tunnels in Madrid at 7.5 km (4.7 mi), Södra länken in Stockholm at 4.7 km (2.9 mi), and the Dublin Port Tunnel at 4.5 km (2.8 mi)).