Lorentz National Park

Lorentz National Park is located in the Indonesian province of Papua, formerly known as Irian Jaya (western New Guinea). With an area of 25,056 km² (9,674 mi²), it is the largest national park in South-East 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. It is the only nature reserve in the Asia-Pacific region to contain a full altitudinal array of ecosystems ranging through marine areas, mangroves, tidal and freshwater swamp forest, lowland and montane rainforest, alpine tundra, and equatorial glaciers. At 4884 meters, Puncak Jaya (formerly Carstensz Pyramid) is the tallest mountain between the Himalayas and the Andes.

Birdlife International has called Lorentz Park “probably the single most important reserve in New Guinea”. It contains five of World Wildlife Fund's "Global 200" ecoregions: Southern New Guinea Lowland Forests; New Guinea Montane Forests; New Guinea Central Range Subalpine Grasslands; New Guinea Mangroves; and New Guinea Rivers and Streams.

Lorentz Park contains many unmapped and unexplored areas, and is certain to contain many species of plants and animals as yet unknown to Western science. Local communities' ethnobotanical and ethnozoological knowledge of the Lorentz biota is also very poorly documented.

The park is named for Hendrikus Albertus Lorentz, a Dutch explorer who passed through the area on his 1909–10 expedition.