World Heritage Identification Number: 1510
World Heritage since: 2016
Category: Natural Heritage
WHE Type: Natural Landscapes & Geographic Features
Transboundary Heritage: No
Endangered Heritage: No
Country: 🇲🇽 Mexico
Continent: Americas
UNESCO World Region: Latin America and the Caribbean
Map
Archipiélago de Revillagigedo: A Remote Pacific Treasure
The Archipiélago de Revillagigedo, inscribed as a UNESCO World Heritage Site in 2016, stands as a testament to the extraordinary biodiversity found within its remote Pacific Ocean location. Comprising four volcanic islands—San Benedicto, Socorro, Roca Partida, and Clarión—the archipelago lies approximately 458 kilometers south and southwest of Cabo San Lucas, the southern tip of the Baja California Peninsula, and 698 to 1,092 kilometers west of Manzanillo. Historically linked to the Mexican state of Colima, these islands are now under Mexican federal property and jurisdiction.
More to come…UNESCO Description of the World Heritage Site
Located in the eastern Pacific Ocean, this archipelago is made up of four remote islands and their surrounding waters: San Benedicto, Socorro, Roca Partida and Clarión. This archipelago is part of a submerged mountain range, with the four islands representing the peaks of volcanoes emerging above sea level. The islands provide critical habitat for a range of wildlife and are of particular importance for seabirds. The surrounding waters have a remarkable abundance of large pelagic species, such as manta rays, whales, dolphins and sharks.
UNESCO Justification of the World Heritage Site
Criterion (vii): Both the landscape and seascape of the Archipiélago de Revillagigedo exhibit impressive active volcanos, arches, cliffs, and isolated rock outcrops emerging from the middle of the ocean. The clear surrounding waters create exceptional scenic vistas with large aggregations of fish gathering around the steep walls and seamounts, as well as large pelagic marine species including Giant Manta Rays, whales, dolphins and sharks. One of the most remarkable aspects of the property is the concentration the Giant Manta Rays which aggregate around the islands and interact with divers in a special way that is rarely found anywhere in the world. Furthermore, the property encompasses an underwater seascape with abyssal plains at depths close to 4,000 meters and sheer drops in crystal clear water, all contributing to an awe-inspiring underwater experience. A large population of up to 2,000 Humpback Whales visits the islands. The songs of these majestic cetaceans can be heard during the winter months and while diving, add another sensory dimension to the marine seascape.
Criterion (ix): The Archipiélago de Revillagigedo is located in the northern part of the Tropical East Pacific Province, a transitional zone influenced mainly by the California current but mixed with the warm waters from the North Equatorial Current. This location results in the convergence of a multitude of fauna and flora, and creates a unique set of biological and ecological processes. The isolation and relatively pristine state of these islands has supported evolutionary processes which result in a high degree of endemicity in both the terrestrial as well as marine realms. In the marine realm the waters surrounding these islands are composed of majestic aggregations of sharks, rays, cetaceans, turtles and fish, a number of which are endemic or near-endemic. On land, important evolutionary processes have led to the speciation of 2 endemic lizards, 2 endemic snakes, 4 endemic birds, at least 33 endemic plant species, and innumerable invertebrates. In addition, 11 endemic subspecies of birds have evolved on the islands, indicating the potential for future evolution on these remote and well protected islands.
Criterion (x): The geographic isolation of the Archipiélago de Revillagigedo, shaped by the prevailing oceanographic conditions, results in high marine productivity, rich biodiversity and exceptional levels of endemism, both terrestrial and marine. The islands are the only breeding site for the Townsend’s Shearwater, one of the rarest seabirds in the world. The Archipiélago de Revillagigedo is also home to the endemic Socorro Dove, Socorro Mockingbird, Socorro Wren, Clarion Wren (as well as 11 endemic bird subspecies), 2 lizards, 2 snakes and numerous endemic plants and invertebrates, all of which contribute to the importance of these islands in conserving terrestrial biodiversity. In the marine realm at least 10 reef fish species have been identified as endemic or near-endemic including the spectacular Clarión Angelfish, which can be observed in ‘cleaning stations’ feeding on the ectoparasites of the Giant Manta Rays. These rays, some of them unusually completely black, aggregate in some of the largest numbers known worldwide. The property is a haven for a rich diversity of shark species with up to 20 having been recorded. Up to 2,000 Humpback Whales also migrate through these nutrient rich and productive waters. The islands are also of significant importance to seabirds notably Masked, Blue-footed, Red-footed and Brown Boobies, Red-billed Tropicbirds, Magnificent Frigatebirds and many other species which can be seen soaring around the rocky outcrops where they nest and fish in the sea.
Encyclopedia Record: Revillagigedo Islands
The Revillagigedo Islands or Revillagigedo Archipelago are a group of four volcanic islands in the Pacific Ocean, known for their unique ecosystem. They lie approximately 458 kilometres (285 mi) from Socorro Island south and southwest of Cabo San Lucas, the southern tip of the Baja California Peninsula, and 698 to 1,092 kilometres west of Manzanillo. Historically linked to the Mexican state of Colima, to which they were granted in 1861 to establish a penal colony, the islands are under Mexican federal property and jurisdiction.Additional Site Details
Area: 636,685.4 hectares
Number of Components: 4
(ix) — Outstanding example representing ecological and biological processes
(x) — Contains most important habitats for biodiversity
Coordinates: 18.7880555556 , -110.9752777778
IUCN World Heritage Outlook
The 2025 Conservation Outlook on Archipiélago de Revillagigedo reports the following assessment:
Source: International Union for Conservation of Nature (IUCN) · View assessment
Image
Lieutenant Debora Barr, NOAA Corps, Public domain
World Heritage Research
Discover scientific research and academic studies that deepen our understanding of Archipiélago de Revillagigedo from its history and significance to its conservation, management, and contemporary challenges.
-
Active Plume, Abandoned Ridge, or Ancient Slab? olivine‐Hosted Melt Inclusions Record the Mantle Melting Conditions Below the East Pacific Revillagigedo Archipelago, Mexico
New research on the Revillagigedo Archipelago reveals that the volcanic activity, previously attributed to hotspot geochemistry, is likely driven by a deep mantle plume rising around a mid-mantle slab remnant. Analysis of olivine-hosted melt inclusions shows melting conditions hotter and deeper than typical mid-ocean ridge basalts (MORBs), suggesting active mantle upwelling confirmed by seismic data indicating a deeper 410 km discontinuity and shallower 660 km discontinuity, implying the presence of hot material below the mantle transition zone. The study finds no evidence of fossil subduction wedge signatures in enriched melts, ruling out an ancient slab influence and supporting the hypothesis of plume-derived melts diluted by a depleted ridge component.
Koornneef, J. M., Tromp, L. J. J., Nikogosian, I. K., Barning, E. M., Deuss, A., Rojas‐Agramonte, Y., Harris, P. D., & van Hinsbergen, D. J. J. (2026). Active Plume, Abandoned Ridge, or Ancient Slab? olivine‐Hosted Melt Inclusions Record the Mantle Melting Conditions Below the East Pacific Revillagigedo Archipelago, Mexico. Geochemistry, Geophysics, Geosystems, 27(4). Portico. https://doi.org/10.1029/2025gc012699
View Publication Record | Read Publication -
Shark movements between islands in the Revillagigedo Archipelago and connectivity to other islands in the Eastern Tropical Pacific
Long-distance shark movements spanning multiple Marine Protected Areas (MPAs) in the Eastern Tropical Pacific highlight critical gaps in conservation efforts. The study tracked 92 Galapagos sharks and silky sharks, revealing that while some sharks remained resident within a single island or MPA, others traveled extensively—including a record-breaking 3,160 km journey by a Galapagos shark from Socorro Island to Clipperton Atoll and Darwin Island. Notably, three sharks crossed between MPAs, including one silky shark that migrated between the Revillagigedo Archipelago (RA) and Clipperton Atoll (CA), then returned. These findings underscore the need for international collaboration to implement effective protection measures, such as swimways or MigraVías, to safeguard shark populations across the region.
Lara-Lizardi, F., Ketchum, J. T., Hearn, A. R., Klimley, A. P., Galván-Magaña, F., Antoniou, A., Arauz, R., Bessudo, S., Castro, E., Chávez, E. J., Clua, E. E. G., Espinoza, E., Fischer, C., Peñaherrera-Palma, C., Steiner, T., & Hoyos-Padilla, M. (2026). Shark movements between islands in the Revillagigedo Archipelago and connectivity to other islands in the Eastern Tropical Pacific. PLOS One, 21(2), e0341840. https://doi.org/10.1371/journal.pone.0341840
View Publication Record | Read Publication -
Unraveling the Volcanic Structure of Oceanic Islands—Gravity Survey of Socorro Island, Revillagigedo Archipelago, Mathematician Ridge, Pacific Plate
A gravity survey of Socorro Island, part of the UNESCO-listed Revillagigedo Archipelago, reveals the volcanic structure beneath one of the most active oceanic islands in the Eastern Pacific. The study identifies a subsidence depth of approximately 100 meters within the island's caldera, correlating with an erupted volume of around 2 cubic kilometers and a caldera size of roughly 4.5 by 3.8 kilometers. This finding sheds light on the post-caldera volcanic activity and stratigraphy, including basaltic and pyroclastic sequences that form the shield edifice. The research employs Bouguer anomaly analysis, upward and downward analytical continuations, vertical derivatives, and 2.5-D forward modeling to constrain subsurface structures and density contrasts, providing a detailed understanding of Socorro Island's volcanic evolution.
Pavón‑Moreno, J. A., Urrutia‑Fucugauchi, J., Pérez‑Cruz, L., & Escorza‑Reyes, M. (2026). Unraveling the Volcanic Structure of Oceanic Islands—Gravity Survey of Socorro Island, Revillagigedo Archipelago, Mathematician Ridge, Pacific Plate. Earth and Planetary Science, 5(1), 1–19. https://doi.org/10.36956/eps.v5i1.2924
View Publication Record | Read Publication -
Mixed-Stock Composition Analyses Suggest Michoacán and Revillagigedo as the Principal Sources of Green Sea Turtle (Chelonia mydas) Foraging Grounds Populations in the Baja California Peninsula
Green sea turtles (Chelonia mydas) foraging populations in the Baja California peninsula, Mexico, primarily originate from nesting sites in the Eastern Pacific, specifically the Revillagigedo Islands and Michoacán coast. A two-year study analyzed mitochondrial DNA from turtles at Bahía de Los Ángeles (BLA) and Complejo Lagunar Ojo de Liebre (CLOL), revealing that both source populations contribute equally to these foraging grounds (Bayes Factor <1.9). This finding highlights the importance of protecting critical nesting areas in Revillagigedo to safeguard these endangered turtles' migratory pathways.
Arce-Jiménez, S., Flores-López, C. A., Ramírez-Delgado, D., & Solana-Arellano, E. (2026). Mixed-Stock Composition Analyses Suggest Michoacán and Revillagigedo as the Principal Sources of Green Sea Turtle (Chelonia mydas) Foraging Grounds Populations in the Baja California Peninsula. Pacific Science, 79(4). https://doi.org/10.2984/79.4.3
View Publication Record | Read Publication -
Beyond a simple wet-to-dry transition: Staged eruptive evolution during growth of the alkaline Bárcena volcano, Isla San Benedicto, México
Research on the Bárcena volcano in Mexico's Revillagigedo Archipelago reveals that its 1952–1953 eruption did not follow a simple wet-to-dry transition but instead involved staged changes in eruptive conditions and magma supply. The study analyzed stratigraphy, grain-size distributions, petrography, SEM observations of juvenile clasts, and whole-rock geochemistry to demonstrate that the volcano's growth was marked by distinct phases: initial pyroclastic cone construction, intra-crater dome extrusion, and a lateral lava breakout. These stages were characterized by varying degrees of magma-water interaction, with Package 2 showing the strongest evidence for such interactions, including structured ash beds and black-glassy juvenile clasts. Geochemical data further indicated that the late lava was less siliceous and more crystalline than the pyroclastic pumice, suggesting a transition from an evolved alkaline suite to a related but less evolved magma domain.
Téllez-Vizcaíno, R. H., Dávila-Harris, P., Varley, N. R., & van Hinsbergen, D. J. J. (2026). Beyond a simple wet-to-dry transition: Staged eruptive evolution during growth of the alkaline Bárcena volcano, Isla San Benedicto, México. Journal of Volcanology and Geothermal Research, 479, 108729. https://doi.org/10.1016/j.jvolgeores.2026.108729
View Publication Record | Read Publication -
Borradas del mapa nacional. La invisibilización de las islas mexicanas frente a la supremacía continental en la cartografía
Mexican islands, particularly those in the Archipiélago de Revillagigedo and other strategic locations, are often omitted or marginalized in national cartography due to a 'continental supremacy' bias. This study reveals how such omissions contribute to their invisibility in public imagination, despite their geopolitical significance as maritime border nodes. Through archipelagic thought and cartographic analysis, the research identifies cases where islands were either underrepresented, inaccurately depicted (e.g., non-existent islands), or erased entirely due to geopolitical pressures—such as the Archipiélago del Norte and Clipperton. The findings underscore the need for more inclusive map representation, advocating for the integration of island toponyms in both political and thematic cartography to highlight their relevance in physical, human, and economic geography.
Baxin Martínez, J. I. (2026). Erased from the national map. The invisibility of Mexican islands in the face of continental supremacy in cartography. Ciencia Y Sociedad, 51(2), 81–104. https://doi.org/10.22206/ciso.2026.v51i2.3753
View Publication Record | Read Publication -
Identification and Distribution of the Brown and Cocos Boobies and Their Subspecies
Research identifies five distinct taxa within the Brown–Cocos Booby complex, distinguishing them through key morphological traits such as head color, underwing covert patterns, iris darkness, culmen concavity, and bill color. These differences vary by sex and subspecies, with male Cocos Boobies exhibiting unique white neck markings that help identify subspecies in the Revillagigedo Islands. The study analyzed 50 museum specimens and 754 living birds from 47 locations, providing critical insights for field identification and tracking population movements under environmental changes.
VANDERWERF, E. A. (2025). IDENTIFICATION AND DISTRIBUTION OF THE BROWN AND COCOS BOOBIES AND THEIR SUBSPECIES. Western Birds, 56(3), 176–199. https://doi.org/10.21199/wb56.3.2
View Publication Record | Read Publication
