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Yellowstone National Park

The vast natural forest of Yellowstone National Park covers nearly 9,000 km2 ; 96% of the park lies in Wyoming, 3% in Montana and 1% in Idaho. Yellowstone contains half of all the world’s known geothermal features, with more than 10,000 examples. It also has the world’s largest concentration of geysers (more than 300 geyers, or two thirds of all those on the planet). Established in 1872, Yellowstone is equally known for its wildlife, such as grizzly bears, wolves, bison and wapitis.

Criteria for inclusion as a World Heritage Site

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ixTo be outstanding examples representing significant on-going ecological and biological processes in the evolution and development of terrestrial, fresh water, coastal and marine ecosystems and communities of plants and animals. All
viiTo contain superlative natural phenomena or areas of exceptional natural beauty and aesthetic importance. All
viiiTo be outstanding examples representing major stages of earth's history, including the record of life, significant on-going geological processes in the development of landforms, or significant geomorphic or physiographic features. All
xTo contain the most important and significant natural habitats for in-situ conservation of biological diversity, including those containing threatened species of outstanding universal value from the point of view of science or conservation. All

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About the source: UNESCO

Within UNESCO's broad remit, this specialised agency of the UN works towards international cooperation agreements to secure the world's cultural and natural heritage, designating venues of exceptional value as World Heritage Sites.