Pontianak is the capital of the Indonesian province of West Kalimantan. It is a medium-size industrial city on the island of Borneo. Pontianak occupies an area of 107.82 km² in the delta of the Kapuas River. It is located almost precisely on the equator, hence it is widely known as Kota Khatulistiwa (Equator City). The city center is actually less than 3 kilometres (2 mi) south, so it is indeed among the closest of any substantial city in the world.