Final answer:
The New Guinea Highlands are a mountain people studied by Leo Pospisil in 1955. They are known for their diverse physical terrain and human geography.
Step-by-step explanation:
The mountain people of western New Guinea studied in 1955 by the North American anthropologist Leo Pospisil are known as the New Guinea Highlands. They are a chain of mountain ranges and river valleys located on Papua New Guinea, which is the largest country in the Pacific realm and Melanesia. The high mountains of the New Guinea Highlands reach 14,793 feet and are known for their diverse physical terrain and human geography.