**Thangmuchhyi (Chepuwa) ** is a village development committee in Sankhuwasabha District in the Kosi Zone of north-eastern Nepal. At the time of the 1991 Nepal census it had a population of 1949 people living in 425 individual households. Thangmuchhyi divided into 3 toles called Dhongdek, Syarkijong (Syarkidang) and Orokchhen and Gangdok and Chhulung also sub tole of Thangmuchhyi. People from Thangmuchhyi are mostly Nuppa clan of Lhomi. Among Nuppa also there are 3 main family groups called Mi-Ngo (Identity). Sonarinjen (Dhongtoek) Mi-Ngo, Ueohok (lower village) Mi-Ngo and Hamo Mi-Ngo. In Dhongtoek (upper household) tole, Sonarinjen clans are living and from Sonarinjen there were three brothers called Nangang Angchuk, Chhiyang Chhedar and Dhinakpa (real name forgotten). It borders Tibet, China.