The Banda Islands (Indonesian: Kepulauan Banda) are a volcanic group of ten small volcanic islands in the Banda Sea, about 140 km (87 mi) south of Seram Island and about 2,000 km (1,243 mi) east of Java, and are part of the Indonesian province of Maluku. The main town and administrative centre is Bandanaira, located on the island of the same name. They rise out of 4-to-6-kilometre (2.5 to 3.7 mi) deep ocean and have a total land area of approximately 180 square kilometres (69 sq mi). They have a population of about 15,000. Until the mid-19th century the Banda Islands were the world's only source of the spices nutmeg and mace, produced from the nutmeg tree.