Lorentz National Park is an Indonesian national park located in the provinces of Central Papua, Highland Papua and South Papua, in the southwest of western New Guinea. With an area of 25,056 km2, it is the largest national park in Southeast Asia. In 1999 Lorentz was declared a World Heritage Site by UNESCO. An outstanding example of the biodiversity of New Guinea, Lorentz is one of the most ecologically diverse national parks in the world.