Udon Thani Province is located in the north of the Khorat Plateau, between the provinces of Khon Kaen to its south, and Nong Khai to its north. The city of Udon Thani, its capital, is served by the railway line that goes northeast from Saraburi through Nakhon Ratchasima (Khorat) and Khon Kaen to the border of Laos on the outskirts of Nong Khai city. Regular direct trains including night sleepers connect the city with Bangkok.