The Rotterdam The Hague Metropolitan Area (Dutch: Metropoolregio Rotterdam-Den Haag) is a cooperation between the cities of Rotterdam and The Hague and 21 other municipalities. It finds its legal basis in law. It was founded in 2014. The area has a population of over 2 million across . The largest European port and a lot of international organizations are within its borders. The area is also part of the larger urban area called Randstad. Air traffic is supported by Rotterdam-The Hague Airport offering services to a number of European cities. RandstadRail offers light rail public transport in the area.