The Banda Sea is the sea of the South Moluccas in Indonesia, technically part of the Pacific Ocean but separated from it by hundreds of islands, as well as the Halmahera and Ceram Seas . It is about 1000 km (600 mi) east to west, and about 500 km (300 mi) north to south.

Islands bordering the Banda Sea include Sulawesi to the west, Buru, Ambon Island, Ceram, Aru Islands, Tanimbar Islands, Barat Daya Islands, and Timor. Although the borders of the sea are hazardous to navigation, with many small rocky islands, the middle of the sea is relatively open. Island groups within the sea include the Banda Islands.