Ubon Ratchathani. The province of eastern and north-eastern Thailand. The district is also home to the main timeline of the country's 105 degrees east longitude. the province is the largest city on the banks of the river has a long history for more than 200 years, a vast area. Later be divided into new provinces of Yasothon in the year 2515 and Amnat Charoen in the year 2536, if the total area of two separate provinces. It was the first province with an area of 1 Thailand.