The Gulf of Tolo (Indonesian: Teluk Tolo) is a large body of water located on the eastern side of the island of Sulawesi, Indonesia. It is a major indentation of the Banda Sea, situated between the island's Eastern Peninsula to the north and the Southeastern Peninsula to the south.
Geographically, the Gulf of Tolo opens into the Banda Sea to the southeast. To the northeast, it is bordered by the Banggai Archipelago, which separates the gulf from the Molucca Sea. The coastline of the gulf falls within the administrative boundaries of the provinces of Central Sulawesi and Southeast Sulawesi.
The waters of the Gulf of Tolo are part of the Coral Triangle, a region recognized for high marine biodiversity. The gulf serves as an important area for local artisanal fishing and regional maritime transport. The coastal topography is characterized by a mix of narrow coastal plains and mountainous terrain, with several small rivers draining into the gulf. In terms of bathymetry, the gulf contains significant depths as it transitions into the deeper basins of the Banda Sea.