Qualla: San Lorenzo Marine Archipelago National Park

San Lorenzo Marine Archipelago National Park: Introduction

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit ricraider, Public domain. Ninety-five percent of all Heermann's gulls on Earth nest on a single rocky outcrop called Rasa Island. Beside them crowd 200,000 elegant terns, practically the entire world population of that species, their cries filling the air above the Gulf of California. This is the San Lorenzo Marine Archipelago National Park, a 50,442-hectare sanctuary where the cold, nutrient-rich waters of Mexico's Sea of Cortez support one of the most concentrated breeding colonies of seabirds anywhere in the world.

Image: ricraider | Public domain

San Lorenzo Marine Archipelago National Park: The Archipelago

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit Traveljournalist at English Wikipedia, Public domain. Five islands make up the park: San Lorenzo, Las Animas, Salsipuedes, Rasa, and Partida. The Salsipuedes Channel separates them from the Baja California mainland to the west. Deep, cold water surrounds these rugged outcrops, fed by winter winds that drive Pacific nutrients into th...

Image: Traveljournalist at English Wikipedia | Public domain

San Lorenzo Marine Archipelago National Park: Seabird Cities

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit Kirt Edblom from Albany, Oregon, United States, CC BY-SA 2.0. Rasa Island alone hosts an estimated 260,000 Heermann's gulls and 200,000 elegant terns during breeding season. American oystercatchers, Craveri's murrelets, and brown pelicans add to the cacophony. On San Lorenzo, Salsipuedes, and Las Animas, between 6,000 and 18,000 nesting pai...

Image: Kirt Edblom from Albany, Oregon, United States | CC BY-SA 2.0

San Lorenzo Marine Archipelago National Park: Giants of the Deep

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit Kirt Edblom from Albany, Oregon, United States, CC BY-SA 2.0. Beneath the surface, the Gulf's bounty supports creatures far larger than terns and pelicans. Blue whales, humpback whales, killer whales, and sperm whales pass through these waters. Green turtles, hawksbill turtles, and olive ridley turtles swim among more than 800 fish species ...

Image: Kirt Edblom from Albany, Oregon, United States | CC BY-SA 2.0

San Lorenzo Marine Archipelago National Park: Desert Islands, Ocean Winds

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit Kirt Edblom from Albany, Oregon, United States, CC BY-SA 2.0. The climate is desert harsh: annual rainfall averages just 2.54 inches, temperatures during July and August reach 95 to 104 degrees Fahrenheit, and high solar radiation combines with constant winds to create intense evaporation. Winter brings northwest winds that push cold, nutri...

Image: Kirt Edblom from Albany, Oregon, United States | CC BY-SA 2.0

San Lorenzo Marine Archipelago National Park: A Park for the Future

Thu, 22 Jan 2026 00:00:00 GMT

Photo credit Kirt Edblom from Albany, Oregon, United States, CC BY-SA 2.0. Mexico established the Parque Nacional Marino Archipielago de San Lorenzo by national decree on April 25, 2005. The park falls under protection of Norma Oficial Mexicana NOM-059-SEMARNAT-2001, the federal standard for endangered species habitat. Though administratively part of Me...

Image: Kirt Edblom from Albany, Oregon, United States | CC BY-SA 2.0