Mexico
Isla Cerralvo
An uninhabited island of volcanic peaks where hammerhead sharks school in their hundreds below.
The water turns dark blue as the boat crosses the channel. The island rises from the Sea of Cortez — volcanic, treeless, uninhabited. Below the surface, hammerhead sharks move in schools so large they block the light from above. You roll backward off the panga into open ocean, and the sharks are already there.
Isla Cerralvo (Jacques Cousteau Island) lies 25 kilometres off the coast of La Paz in the Sea of Cortez, a volcanic island with no permanent residents and no development. The seamounts surrounding the island attract schooling hammerhead sharks between November and May, with aggregations sometimes exceeding a hundred individuals. Whale sharks, manta rays, and mobula rays pass through the surrounding channels seasonally, making the island one of the richest pelagic dive sites in the Sea of Cortez. The island's terrestrial environment is desert — volcanic rock, cardon cacti, and rattlesnakes — with empty beaches suitable for camping between dives. Dive operators from La Paz run day trips and overnight expeditions. The Sea of Cortez, which Cousteau famously called 'the world's aquarium,' supports over 900 fish species and 39% of the world's marine mammal species. Currents around the island can be strong, and the diving is best suited to experienced divers comfortable in open-water conditions.
Friends
Schooling hammerheads, manta rays, and camping on an uninhabited volcanic island — Isla Cerralvo is a Sea of Cortez diving expedition that groups will talk about for decades.
Solo
Joining a dive boat to an uninhabited island, dropping into blue water with hammerhead sharks — Isla Cerralvo is a solo dive experience at the outer edge of accessible adventure.
- Schooling hammerhead sharks gather in the hundreds at the island's seamounts between November and May.
- The island is uninhabited and undeveloped — there are no facilities, just volcanic rock and blue water.
- Whale sharks, manta rays, and mobula rays all pass through the surrounding channels seasonally.
Ceviche de jurel — yellowtail ceviche — prepared on the dive boat from the morning's sightings.
Camp-cooked lobster on the island's empty beach, the Sea of Cortez turning silver at sunset.
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