ANCA was established in 2010 AD WHICH falls within two physiographic zones of Nepal: High Mountain and High Himalaya.
The total area of ANCA is 1903 sq. km which is characterized by steep hills and river valleys in the lower portion and mountains, glaciers and high valleys in the upper portion.
ANCA lies in Darchula district with Khalanga, Mahakali (today part of Mahakali Municipality) as its district headquarters, covers an area of 2,322 km2 (897 sq mi) and has a population (2011) of 133,274.
The highest point within the entire conservation area is Mt. Api with the height of 7,132 masl. Moreover the conservation area is named after two mountains in the area: Mt Api (7,132 masl) and Mt Nampa (6,757 masl).
ANCA encompasses parts or all of five Rural Municipalities (RMs) and one Municipality with a total resident population of approximately 60,000 people, of whom 52 per cent are female and 48 per cent male.