Palau (historically Belau or Pelew), officially the Republic of Palau (Palauan: Beluu er a Belau), is an island country located in the western Pacific Ocean. The country's population of around 21,000 is spread across 250 islands, which form the western chain of the Caroline Islands in Micronesia. The most populous of these is Koror. The capital Ngerulmud is located on the nearby island of Babeldaob, in Melekeok State. Palau shares maritime boundaries with Indonesia, the Philippines, and the Federated States of Micronesia.