"The Marianas Trench Marine National Monument consists of three units : the Trench Unit, encompassing the submerged lands within the Mariana Trench ; the Volcanic Unit, encompassing 21 designated volcanic features and the surrounding submerged lands out to a radius of 1 nautical mile (nm) ; and the Islands Unit, encompassing the waters and submerged lands of the three northernmost Mariana Islands (Farallon de Pajaros, Maug, and Asuncion) from the mean low water line out approximately 50 nautical miles. The Marianas Trench is approximately 940 nautical miles long and 38 nautical miles wide. Important bottom habitats are protected in the Volcanic and Trench Units, and the Government of the Commonwealth of the Northern Mariana Islands (CNMI) maintains all authority for managing the three islands within the Islands Unit above the mean low water line. The Monument encompasses approximately 24 million hectares of submerged lands and waters of the Marianas Archipelago. It is managed by the National Oceanic and Atmospheric Administration, the U.S. Fish and Wildlife Service, and the Commonwealth of the Northern Marianas Islands (CNMI), a U.S. territory.
- Islands Unit
- Trench Unit
- Volcanic Unit
Source: UNESCO World Heritage Tentative List
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