Nong Bua Lamphu is one of Thailand's seventy-six provinces (changwat). It lies in upper northeastern Thailand, a region also known as Isan or Isaan. Neighbouring provinces are Udon Thani, Khon Kaen, and Loei. Nong Bua Lamphu is one of the eight quadruply-landlocked Thai provinces, as its neighboring provinces are triply-landlocked.

Amnat Charoen is one of Thailand's seventy-six provinces (changwat) and lies central northeastern Thailand, also called Isan. Neighbouring provinces are Ubon Ratchathani, Yasothon, and Mukdahan. To the east it borders Salavan of Laos. Its name is a concatenation of อำนาจ and เจริญ ("prosperous").