Natural world heritage is a piece of nature that should be preserved for the world in the future. UNESCO is an organization of the United Nations. She has a list written: it contains the natural assets that are part of the natural world heritage.
There are several reasons why a landscape can make the list. It shows how life on earth developed or how the earth is structured. Many different animals and plants live there, and if the landscape were to disappear, these species would also be in danger. In addition, something particularly beautiful can be a World Heritage Site.
Some natural properties are both a natural world heritage site and a world cultural heritage site. An example is the Bay of Kotor in Montenegro. There you can see small towns and monasteries from the Middle Ages, built into a beautiful landscape.