Brunei and Muara is the smallest district (daerah) in Brunei, as well as the northern-most. Its capital is Bandar Seri Begawan, which is also the national capital. Other major towns and cities include Muara .

The district borders the South China Sea to the north, Brunei Bay to the east, Malaysia to the south and the Bruneian district of Tutong to the west.

There are several offshore islands in the Brunei Bay belonging to the district.