The Amsterdam Metro is a rapid transit system serving Amsterdam, Netherlands, and extending into the surrounding municipalities of Diemen and Ouder-Amstel. The network is owned by the City of Amsterdam and operated by GVB, the municipal public transport company that also operates the city’s trams, buses, and ferries. The metro forms one part of Amsterdam’s rail-based public transport network alongside the extensive tram system and frequent regional and intercity trains operated by Nederlandse Spoorwegen (NS).