Volcanic activity and uplift raised Guam more than 7 miles from the depths of the Mariana Trench. As the volcanic bedrock neared the surface, coral colonies started growing. Millions of years of coral growth and changing sea levels transformed an ancient barrier reef into dramatic 500-foot limestone cliffs fringed by coral forests and beaches.

Guam National Wildlife Refuge was established in 1993 with the Ritidian Unit, which was excessed by the U.S. Navy. Most of the refuge, about 22,500 acres, is an "overlay refuge" on lands administered by the U.S. Air Force and U.S. Navy. Although the military mission comes first on these lands, the U.S. Fish and Wildlife Service assists in protecting native species and habitats. The refuge also protects significant cultural resources of the Chamorro people.

News Release

Guam National Wildlife Refuge Draft Comprehensive Conservation Plan
Released for Public Review and Comment