The Mun river valley forms the southern provincial border of this panhandle before extending somewhat diagonally northeast to meet the provincial border with Roi Et province just west of Road 215, effectively cutting off the mainly agricultural panhandle area from the rest of Surin.
The Mun river valley forms the southern provincial border of this panhandle before extending somewhat diagonally northeast, opening up into a large lake near Tha Tum. Leaving the lake, the Mun continues on to meet the provincial border with Roi Et province just west of Road 215, effectively cutting off the mainly agricultural panhandle area from the rest of Surin.