Visitors to Bau-Bau, the main city on Buton Island, may well be welcomed with a mangaru, which is a welcome dance performed by three men to respect guests and to ward off enemies. Overlooking Bau-Bau is Benteng Keraton Buton, known as having been the seat of the sultan. Claiming to be the biggest fort in Indonesia and made of coral blocks, it commands an excellent view over the city and port and the sea beyond.