Ubon Ratchathani (often within short Ubon) is one of the north-eastern provinces of Thailand, and the country's easternmost. Ubon is approximately 600 km away from Bangkok. Sisaket, Yasothon and Amnat Charoen are the famous districts of the province.. To the northern and east it boundaries Salavan and Champasak of Laos, towards the south Preah Vihear of Cambodia. At Khong Chiam the Mun river, the large-scale stream of the Khorat Plateau, connects the Mekong, which types the north-eastern side of Thailand with Laos.

Ubon Ratchathani, the province of Thailand is established about 84 km. The locality where the boundaries of the three nations Thailand, Laos and Cambodia rendezvous is encouraged as the Emerald Triangle, within compare to the Golden Triangle within the northern of Thailand. The Emerald mentions to the wide intact monsoon timber plantations there. Another natural location which attracts visitors is namtok Saeng Chan. This waterfall is 1 km. away from Thung Na Muang Waterfall.