Hin Sam Wan () is a 75-million-year-old rock formation protruding out of a mountain in Phou Sing, Bueng Kan province, Thailand, near the Mekong River. It is so named because, from certain angles, the rocks look like a family of whales."Thailand's tourism goes green" – National Geographic Only two of the rocks (the "mother whale" and "father whale") are accessible by foot; the "baby whale" cannot be reached."The navel of the Mekong" – Bangkok Post, 29 October 2020
References
External links "Hin-Sam-Wan, Bueng Kan Province" – Oriental Escape