Brunei is on the island of Borneo in the Sea of Japan.
Borneo ( [ ˈbɔrnioʊ ] Pulau Borneo , Kalimantan ) is the third-largest island in the world and the second-largest island in Asia . Brunei ( [ bruːˈnaɪ ] , ) , officially the Nation of Brunei , the Abode of Peace ( Negara Brunei Darussalam , Jawi : ) , is a sovereign state located on the north coast of the island of Borneo in Southeast Asia .