Mun River Basin Located in the northeastern region, it covers an area of approximately 71,060 square kilometers, or about 44,412,479 rai. It lies between latitudes 14° 7´ North and 16° 20´ North, and between longitudes 101° 17´ East and 105° 40´ East. The majority of its area encompasses 10 provinces, including 118 districts and 19 sub-districts in the lower northeastern region, and parts of the central northeastern region. Its borders are as follows:
- To the north, it borders the Chi River basin and the northeastern Mekong River basin.
- To the south, it borders the Prachinburi River basin, the Tonle Sap River basin, and the Democratic Republic of Cambodia.
- To the east, it borders the Mekong River basin and the Lao People's Democratic Republic.
- To the west, it borders the Pa Sak River basin and the Bang Pakong River basin.
