Brunei

Brunei, officially the Nation of Brunei, is a country located on the north coast of the island of Borneo in Southeast Asia. Apart from its coastline with the South China Sea, the country is completely surrounded by the insular Malaysian state of Sarawak. It is separated into two parts by the Sarawak district of Limbang. Brunei is the only sovereign state completely on the island of Borneo; the remainder of the island's territory is divided between the nations of Malaysia and Indonesia. Brunei's population was 428,963 in 2018. The government is an absolute monarchy under the Sultan, which implements a combination of English common law and sharia law, as well as direct general Islamic practices.
Source: Wikipedia.