... Science, Earth Sciences 24 (2008) 1-9 1 Territorial organization for ecotourism development in Hoang Lien National Park, Sapa District, Lao Cai Province Nguyen Thi Hai, Nguyen Thi Quy Hoi, Tran ... Institute of Forest Research and Planning, Project of Investment in Hoang Lien National Park, Lao Cai Province, Hanoi, 2003 (in Vietnamese). [2] Nguyen Thi Hai, Nguyen An Thinh, Ecotourism Territorial ... units [2]. 3. Forces for TOET in Hoang Lien National Park HLNP is situated in the northwest of Sapa District, at the triangle of boundaries of three provinces: Lao Cai, Hoa Binh, and Son La....