Ubon Ratchathani

Ubon Ratchathani often in short Ubon is one of the north-eastern provinces of Thailand, and the country's easternmost. Ubon is about 600 km away from Bangkok. Neighboring Provinces are (from west clockwise) Sisaket, Yasothon and Amnat Charoen. To the north and east it borders Salavan and Champasak of Laos, to the south Preah Vihear of Cambodia.

At Khong Chiam the Mun river, the biggest river of the Khorat Plateau, joins the Mekong, which forms the north-eastern boundary of Thailand with Laos. It is called Maenam Song Si or the Mun River alluvium because the brown water from Mekong River is mixed with blue water from Mun River. It is located about 84 km. from Ubon Ratchathani City centre.

The area where the borders of the three countries Thailand, Laos and Cambodia meet is promoted as the Emerald Triangle, in contrast to the Golden Triangle in the north of Thailand. The Emerald refers to the large intact monsoon forests there.