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Bandar Seri Begawan is the capital and largest city of Brunei, located on the Brunei River. The city has a population of about 150,000 people and is the seat of the Brunei government. Bandar Seri Begawan is a modern city with a mix of traditional and modern architecture. The city is home to many historical sites, including the Sultan Omar Ali Saifuddien Mosque and the Royal Regalia Building.