The de facto boundary ran along the watershed between the Brunei River and Limbang River basins on the western side of the district, and along the length of the Pandaruan River on the eastern side.
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | Brunei | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River |
In Brunei, the story is Nakhoda Manis and is associated with a prow-like rock, Jong Batu, in the Brunei River.