Rotterdam ( /ˈrɒtərdæm/; Dutch [ˌrɔ.tər.ˈdɑm] ( listen)) is the second-largest city in the Netherlands and one of the largest ports in the world. Starting as a dam constructed in 1270 on the Rotte River, Rotterdam has grown into a major international commercial centre. Its strategic location at the Rhine-Meuse-Scheldt delta on the North Sea and at the heart of a massive rail, road, air and inland waterway distribution system extending throughout Europe is the reason that Rotterdam is often called the "Gateway to Europe".

Located in the Province of South Holland, Rotterdam is found in the west of the Netherlands and at the south end of the Randstad. The population of the city proper was 616,250 on February 1st 2012. The population of the greater Rotterdam area, called "Rotterdam-Rijnmond" or just "Rijnmond", is around 1.3 million people. Rotterdam is one of Europe's most vibrant, multicultural cities. The city is known for its university (Erasmus), its cutting-edge architecture, its lively cultural life, its striking riverside setting, its maritime heritage and the Rotterdam Blitz.