Roi Et

Roi Et lies on the Khorat Plateau in the basin of the Chi River. Its history is closely bound to the Lao town of Suwannaphum, founded earlier in the eighteenth century by people from the Champasak kingdom. A dispute among Suwannaphum's leaders led one group under Katiyawongsa to leave and establish Roi Et in 1775. The new town became another centre of Lao settlement and Siamese authority in the plateau's interior.

The later city of Maha Sarakham also lies here.