Amphoe Na Noi 3.81

Na Noi is a district in Nan Province, northern Thailand.HistoryNa Noi was originally named Wiang Si Sa Ket . In 1899 it became part of the province Nan. Though it was originally planned to merge Sisaket and Tha Pla into one district, in 1903 Tha Plan was integrated into Uttaradit Province. In 1917 the name of the district was changed, to avoid confusion with the Sisaket Province.GeographyNeighboring are from the north clockwise Wiang Sa, Laos, Ban Khok (Uttaradit Province), Na Muen and Rong Kwang (Phrae Province).The main river is the Nan River in the eastern part of the district. The Nam Haeng river, which flows through the town Na Noi to flow into the Nan further east. Upriver of Na Noi town is the Nam Haeng Reservoir.Also in the west of the district is the Si Nan National Park, protecting the forested Phi Pan Nam mountains which separate the valleys of the Nan and the Yom rivers.Erosion formed the strange shapes named Hom Chom, found not far north of the town Na Noi. The mounds, some rather sharp, remained when rainwater and brooks cut into the sandstone.The eastern part of the district is located in the Luang Prabang Range mountain area of the Thai highlands.