Coronavirus (COVID-19) Notice
Although most refuge lands and outdoor spaces have remained open for the public to enjoy, we ask that you do the following:

  • Check local conditions on this website and call ahead for current information. Operations vary based on local public health conditions.
  • Face masks are required in all federal buildings and on all federal lands.
  • Maintain a safe distance between yourself and other groups.
  • Wash your hands often with soap and water for at least 20 seconds
  • Avoid touching your eyes, nose and mouth
  • Cover your mouth and nose when you cough or sneeze
  • Most importantly, stay home if you feel sick

Things to Know

Draft Environmental Assessment Evaluating Requested Right-of-Way

April 6, 2021 Newspaper

The U.S. Fish and Wildlife Service is seeking public review and comment on a draft environmental assessment that evaluates the effects of the agency issuing a Right-of-Way permit for a proposed communications cable through the Refuge. The draft EA will be available for public comment from March 22 – April 6.

Draft Environmental Assessment

Draft Monument Management Plan and Environmental Assessment – Public Comment Period


NOAA Fisheries and the U.S. Fish and Wildlife Service (USFWS) are pleased to announce that the Marianas Trench Marine National Monument draft management plan is available for public review and comment.

Draft Monument Management Plan and Environmental Assessment

Voyage to the Marianas Trench Marine National Monument

APASEEM ( produced this video through a Department of the Interior Technical Assistance grant. This video covers the scope and beauty of the Marianas Trench Marine National Monument as well as the unique scientific discoveries in the area.

First Voyage to the Mariana Trench MNM
Blinded Me With Science

Journey to to Depths

Okeanos Mariana Trench 150x133

Follow Okeanos Explorer as they fullfill their mission to explore and document the Mariana Trench

Okeanos Explorer Live Feed

About the Complex

Pacific Reefs

Mariana Trench National Wildlife Refuge is managed as part of the Pacific Reefs.

Read more about the complex
About the NWRS

National Wildlife Refuge System


The National Wildlife Refuge System, within the U.S. Fish and Wildlife Service, manages a national network of lands and waters set aside to conserve America's fish, wildlife, and plants.

Learn more about the NWRS