Brač is a Croatian island in the Adriatic Sea, with an area of 396 square kilometres (153 sq mi), making it the largest island in Dalmatia, and the third largest in the Adriatic. It is separated from the mainland by the Brač Channel, which is 5 to 13 km wide. The island's tallest peak, Vidova gora, stands at 780 m (2,560 ft), making it the highest point of the Adriatic islands. The island has a population of 13,931, making it also by population the largest island in Dalmatia and the third largest in the Adriatic. The island is divided in eight municipal units with twenty-two settlements, ranging from the main town Supetar, with more than 3,300 inhabitants, to Murvica, where less than two dozen people live. Brač Airport is the largest airport of all islands surrounding Split.