The Amsterdam Metro is a mixed rapid transit and light rail system in Amsterdam, and its surrounding municipalities Amstelveen, Diemen, and Ouder-Amstel in the Netherlands. The network is owned by the city of Amsterdam and operated by the Gemeentelijk Vervoerbedrijf, the company that also operates trams, ferries and local buses. There are four lines in the metro system. Three lines start at Amsterdam Centraal, of which line 53 and 54 connect the city centre to Diemen, Duivendrecht, and Amsterdam Zuidoost in the southeast, and line 51 connects the city centre to Amstelveen in the south. The Ring Line, line 50, connects Amsterdam Zuidoost to the west without crossing the centre of the city.