Tat Hai Waterfall is a tourist destination located in the area of Koksaard sub-district, Nam Khuan district, Ubon Ratchathani province. This waterfall has its water source from the Phrom Dongrak mountain range, which forms the border between Thailand and the Kingdom of Cambodia. Surrounding the waterfall, there are beautiful rocky islands, and the water flows year-round, with its highest volume occurring from June to December each year.