Ubon Ratchathani province The Eastern Province of Northeast Thailand and the Thai Nation Party. It is also a district of the main timeline of the 105-degree Meridian East. Lol all over the country. Ubon Ratchathani province is the major cities along the River have completed a long history for more than 200 years later, vast areas were separated into a new province is the province of yasothon in tr.Prof. amnat Charoen province and 2515 (1972) in two other areas, which include 2536 (1993), if a separate province. Ubon Ratchathani province are the country's largest area of Thai 1.