sentences:  Originally it consisted of the three "tambons", Na Thanung, Bo Kaeo, and Mueang Li.It was upgraded to a full district on 4 July 1994.Neighboring districts are, from the north clockwise, Na Noi of Nan Province, Ban Khok, Fak Tha, Nam Pat and Tha Pla of Uttaradit Province, Mueang Phrae and Rong Kwang of Phrae Province.