Tutong

Tutong lies on the river of the same name in northern Borneo, where the water flows from the forested interior toward the South China Sea. The Tutong people were associated with the river's lower reaches, while Dusun communities lived farther inland between the Tutong and Belait watersheds. As with many names in Borneo, Tutong originally referred to people living along a particular river rather than to a single fixed political community.

The later city of Kuala Belait also lies here.