Brunei Bay

Brunei Bay opens along the northwestern coast of Borneo, east of the old capital at Bandar Seri Begawan. Its sheltered waters are divided among Brunei, Sarawak and Sabah, with broad tidal flats, mangrove forest, seagrass and small sandstone islands. Rivers entering the bay link the interior to the coast, and boats can move through channels protected from open-sea swell.

The bay formed the maritime approach to the Sultanate of Brunei. River settlements, capital towns and trading posts depended on boats for rice, sago, forest goods, cloth and metal. Mangroves supplied timber, fuel and food, while shallow reefs and mudflats supported fish and shellfish. Coastal and interior peoples met at river mouths and periodic markets.

Temburong, isolated overland by Sarawak, remained tied to Brunei through the water. Navigation followed tides and river channels rather than a single road, and settlements shifted with trade and river sedimentation. Brunei Bay’s identity comes from this layered meeting of sultanate politics, river trade and a richly varied tropical shore. Mangrove timber built houses and boats. Rivers carried sago and forest goods downstream.