Kampong Ayer or the Water Village s the world's largest Water village, located on the Brunei River in Banda Seri Begawan Kampong Ayer is a culturally important part of Brunei that preserves the nation's river dwelling origins. 32. Culture & Festival His Majesty the Sultan's Birthday ls on 15 July every year at Sultan Omar Ali Saifuddin Mosque, Bandar Seri Begawan. 33, Art & Music Adai Adai Is a group work song sung by fisher people while they fished. It is usually performed by three men and three women