Wat Ahong Silawas in tambon Khaisi of Muang Bung Kan, and adjacent to Ahong Creek, is believed to be the deepest part of the Mekong River — about 196 metres — measured using rope attached to a stone. According to legend, the river’s deepest point is opposite this temple where there is an underwater cave leading to Laos, and which is inhabited by giant Mekong catfish.