The Sultanate of BRUNEI is a sovereign state located in the South China Sea. It is a small nation, but it has a long history and a rich culture. BRUNEI is a monarchy, ruled by the Sultan of BRUNEI, who is the head of state and government. The Sultanate of BRUNEI has been in existence since the 15th century and is one of the oldest surviving sultanates in the world. BRUNEI is known for its oil and gas reserves, which have made it one of the wealthiest countries in Southeast Asia.