Isla Coronado – Loreto & Bay of Loreto

Site Overview

Isla Coronado is a volcanic island within the Bay of Loreto National Park featuring dramatic underwater walls, a playful sea lion colony, and rich biodiversity including sea turtles and diverse nudibranch species that make it one of the most rewarding dive sites in the Loreto region. The island's volcanic origins created spectacular underwater topography with sheer rock walls descending from the surface to 25 metres, adorned with colourful gorgonian sea fans, sponges, and diverse invertebrate communities that thrive in the nutrient-rich Sea of Cortez waters. A permanent colony of California sea lions inhabits the island's rocky shores and underwater environments, with juveniles regularly approaching divers for curious interactions and photogenic barrel rolls. Green sea turtles are regular visitors during the warmer months, gliding gracefully along the volcanic walls while feeding on algae and invertebrates. The island's protected position within the national park has preserved healthy reef ecosystems with abundant fish populations including yellow snapper, king angelfish, and diverse wrasses. Macro enthusiasts will find Isla Coronado particularly rewarding with over 30 species of nudibranchs documented on the volcanic substrate, ranging from tiny chromodorids to large spanish dancers. The combination of wall diving, marine mammal encounters, turtle sightings, and macro biodiversity in a pristine national park setting makes Isla Coronado a comprehensive diving experience that showcases the best of what the Bay of Loreto has to offer.