Svalbard is an archipelago lying in the Arctic Ocean north of mainland Europe. It consists of a group of islands. The archipelago is the northernmost part of the Kingdom of Norway. Three islands are populated: Spitsbergen, Bjørnøya and Hopen. The largest settlement is Longyearbyen. The Svalbard Treaty recognises Norwegian sovereignty over Svalbard. With the 1925 Svalbard Act, Norway chose to make Svalbard a part of the Kingdom, and it remains one of four special entities whose status is recognized by international treaty in the world today.