Pacific Islands Heritage Marine

Pacific Islands Heritage Marine National Monument encompasses approximately 495,189 square miles of the central Pacific Ocean, making it one of the largest marine protected areas on Earth. The monument protects seven remote islands and atolls: Baker, Howland, and Jarvis Islands; Johnston and Wake Atolls; Palmyra Atoll; and Kingman Reef. Originally established in 2009 as the Pacific Remote Islands Marine National Monument and expanded in 2014, it was renamed in January 2025 to honor the cultural heritage of Indigenous Pacific Islander peoples. These isolated specks of land support some of the most pristine coral reef ecosystems remaining on the planet, serving as critical refuges for endangered species and migrating wildlife.

The monument harbors extraordinary wildlife diversity, including threatened green and hawksbill sea turtles, with approximately 200 green turtles foraging at Johnston Atoll alone. Six endangered or depleted whale species use these waters, including sperm, blue, sei, humpback, and North Pacific right whales, while spinner dolphins are abundant throughout. The coral reefs support remarkable fish populations including giant groupers, Napoleon wrasses, bumphead parrotfish, and abundant reef sharks. Kingman Reef represents the most pristine coral reef ecosystem within United States jurisdiction, uniquely dominated by apex predators in proportions not seen elsewhere in the Pacific. Giant clams, pearl oysters, and coconut crabs thrive in these protected waters.

The monument's islands support unique terrestrial vegetation adapted to isolated oceanic conditions. Palmyra Atoll's Pisonia forest provides critical nesting habitat for seabirds, while native coastal strand vegetation stabilizes the sandy soils of these low-lying islands. The marine ecosystems host spectacular coral diversity, with Johnston Atoll alone supporting at least 45 coral species including thriving table coral communities. Deep-diving surveys have revealed that Johnston supports the deepest reef-building corals on record. The 165 known seamounts within the monument create hotspots of underwater biodiversity, with hydrozoan corals and diverse marine plants colonizing their slopes. These isolated ecosystems harbor species found nowhere else on Earth.

The monument's islands represent various stages of atoll formation, from ancient coral rings like Johnston Atoll, possibly one of the oldest in the Pacific Ocean, to Palmyra and Kingman, remnants of volcanoes from 65 to 120 million years ago. Johnston Atoll comprises four low-lying islands surrounding a shallow lagoon, while Kingman Reef barely breaks the surface as a submerged atoll rim. The 165 seamounts rising from the deep Pacific seafloor create dramatic underwater topography that influences ocean currents and concentrates marine life. These volcanic remnants and coral formations provide windows into Pacific tectonic history, with the islands slowly subsiding and eroding over geological time while coral growth struggles to keep pace with sea level changes.

The monument spans a vast oceanic area experiencing tropical to subtropical climate conditions. Temperatures remain warm year-round, typically ranging from 75 to 85 degrees Fahrenheit, with the equatorial islands receiving abundant rainfall while northern atolls like Wake experience more seasonal variation. Trade winds blow consistently from the northeast, moderating temperatures and driving ocean currents that transport nutrients and larvae between islands. These remote islands are vulnerable to tropical cyclones, though their low-lying nature and isolation provide some natural protection. Climate change poses significant threats, with warming ocean temperatures causing coral bleaching events and sea level rise threatening to inundate these barely emergent atolls.

Polynesian voyagers were the first humans to reach some of these remote islands, leaving archaeological evidence on Palmyra Atoll of their remarkable navigation abilities. Western exploration began in the early 19th century, with various nations claiming these strategically located islands. Wake Island became a critical transpacific waypoint, while Johnston Atoll served various military purposes including nuclear weapons testing. During World War II, Wake Island witnessed intense combat as Japanese forces captured the island from American defenders. The United States formally claimed the various islands through the Guano Islands Act and subsequent annexations, eventually establishing wildlife refuges to protect their ecological values.

President George W. Bush established the Pacific Remote Islands Marine National Monument on January 6, 2009, protecting waters around the seven islands and atolls. President Barack Obama dramatically expanded the monument on September 25, 2014, extending protections to 200 nautical miles from each island's shoreline, creating one of the world's largest marine protected areas. In January 2025, the monument was renamed Pacific Islands Heritage Marine National Monument to recognize the cultural significance of these islands to Indigenous Pacific Islander peoples. Management is shared between the U.S. Fish and Wildlife Service and NOAA, with the Department of Defense maintaining authority over Wake and Johnston Atolls.

Given the extreme remoteness of these islands, traditional visitor attractions are limited. Palmyra Atoll, the only island allowing recreational access, offers opportunities to experience pristine coral reefs, observe abundant seabirds, and witness one of Earth's most intact tropical marine ecosystems. The underwater landscapes provide world-class snorkeling and diving for permitted visitors, with visibility often exceeding 100 feet. Scientific research expeditions study the monument's unique ecosystems, documenting biodiversity and monitoring climate change impacts. Johnston Atoll's 22 species of nesting seabirds, including the third-largest red-footed booby colony in the world at Palmyra, offer spectacular wildlife viewing for researchers fortunate enough to visit.

Access to the Pacific Islands Heritage Marine National Monument is extremely limited due to the islands' remote locations, ranging from 800 to over 1,400 miles from the nearest major airports. Palmyra Atoll National Wildlife Refuge is the only unit permitting recreational visitation, requiring a Special Use Permit from the U.S. Fish and Wildlife Service. Visitors to Palmyra typically arrive by private yacht or arranged charter, as no commercial transportation serves the island. Basic facilities exist for researchers, but visitors must be self-sufficient. Wake and Johnston Atolls are managed by the Department of Defense with restricted access. The nearest major gateway is Honolulu, Hawaii, from which research vessels and permitted visitors depart.

The monument provides critical protection for some of Earth's most pristine marine ecosystems. Commercial fishing, mining, and other extractive activities are prohibited, allowing fish populations and coral communities to thrive naturally. The intact predator populations at Kingman Reef demonstrate what healthy coral reef ecosystems look like without human exploitation. Research programs monitor coral health, track sea turtle and seabird populations, and study the impacts of climate change on these vulnerable ecosystems. The monument serves as an invaluable scientific reference site, providing baseline data for understanding healthy tropical marine systems. Conservation efforts focus on preventing invasive species introductions, monitoring climate impacts, and maintaining the ecological integrity that makes these islands globally significant.