The Mariana Islands are home to several types of coral reefs, both close to the islands and farther offshore. Coral reefs are considered among the world’s most diverse and complex ecosystems. Many of the coral reefs in the Mariana Islands are well developed, support a wide range of recreational and commercial activities, and provide natural shoreline protection.

The Navy strives to limit its impact on coral reefs and conducts the following activities:

• Regular surveys since 1999 to study the condition of coral reefs and other plants and animals around FDM. Based on these surveys, there is no evidence that training activities have had significant impacts on marine resources.
• Participates in the U.S. Coral Reef Task Force, a group of government agencies that works to protect coral reefs around the world.