Saint Martin (French: Saint-Martin; Dutch: Sint Maarten) is an island in the northeast Caribbean, approximately 300 km (190 mi) east of Puerto Rico. The 87-square-kilometre (34 sq mi) island is divided roughly 61/39 between France (53 square kilometres (20 sq mi)) and the Kingdom of the Netherlands (34 square kilometres (13 sq mi)); the two parts are roughly equal in population. It is the smallest sea island divided between two nations with inhabitants. The division dates to 1648. The southern Dutch part comprises Sint Maarten and is one of four constituent countries that form the Kingdom of the Netherlands. The northern French part comprises the Collectivité de Saint-Martin (Collectivity of St. Martin) and is an overseas collectivity of France.