Pontianak, is the capital of the Indonesian province of West Kalimantan, founded first as a trading port on the island of Borneo, occupying an area of 118.21 km2 in the delta of the Kapuas River, at a point where it is joined by its major tributary, the Landak River. The city is on the equator, hence it is widely known as Kota Khatulistiwa (Equatorial City). The city center is less than 3 kilometres (2 mil) south of the equator. Pontianak is the 23rd most populous city in Indonesia (as at 2023)