WEB1 day ago · Brunei, [d] officially State of Brunei, and formally Brunei Darussalam, [e] [f] is a country in Southeast Asia, situated on the northern coast of the island of Borneo. Apart from its coastline on the South China Sea, it is completely surrounded by the Malaysian state of Sarawak, with its territory bifurcated by the Sarawak district of Limbang.