El Arrecife
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
El Arrecife runs along Malpelo's flank as the island's workhorse dive, a sloping rock reef where nearly everything the sanctuary protects makes an appearance. Hammerhead schools materialize out of deeper water, break apart around the divers' bubbles, and reform; Galapagos sharks own the mid-water; whitetips and morays fill the terrain. In the warm months silky sharks gather here in the extraordinary aggregations Malpelo is known for, sometimes hundreds strong near the surface, turning the safety stop into the dive's climax. Seasonal visitors - a whale shark cruising the drop, tuna blasting through bait - round out a site that rewards simply staying put and watching.
The moment you come for: Silky aggregations in season, reforming hammerhead schools, action from seabed to safety stop
Topography: Sloping rock reef falling to walls and deep water
Know before you splash
Hazards: Strong current along the slope; blue-water ascents with attentive panga cover required.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Galápagos Shark
Scalloped Hammerhead
Silky Shark
Whale Shark
Whitetip Reef Shark
For photographers
Wide angle: ★★★★★ · Macro: ★☆☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting