Nam Et-Phou Louey National Biodiversity Conservation Area (NBCA) is a protected area in northern Laos, covering 5,959 km2 in three provinces — Houaphan, Luang Prabang and Xieng Khouang. The park includes a 3,000 km2 core area where human access and wildlife harvest is prohibited and a 2,950 km2 buffer area where pre-existing villages are allocated land for subsistence living. The park consists mainly of mountains and hills, with altitude ranging between 336 and 2257 metres above sea level.