Total number of UNESCO Biosphere Reserves Natural Sites: 0 (2019)
This is a description of the total number of UNESCO Biosphere Reserves Natural Sites as of 2019. As of 2019, there are 0 UNESCO Biosphere Reserves Natural Sites in existence. These sites are designated by UNESCO as areas of protected land and water that are managed to promote sustainable development and
The Monarch Butterfly Biosphere Reserve is a World Heritage Site containing most of the overwintering sites of the eastern population of the monarch butterfly. The reserve is located in the Trans-Mexican Volcanic Belt pine-oak forests ecoregion on the border of Michoacán and State of Mexico, 100 km, northwest of Mexico City. Millions of butterflies arrive in the reserve annually. Butterflies only inhabit a fraction of the 56,000 hectares of the reserve from October–March. The biosphere's mission is to protect the butterfly species and its habitat.