A huge, remote platform-reef atoll some 35 km off Mexico's Costa Maya, protected as a biosphere reserve since 1996 and famous for regulated in-water encounters with American crocodiles at Cayo Centro, a snorkel-only historic shipwreck graveyard, and barely-dived walls.
Destination info
Conditions, highlights, and the resident marine life.
Conditions
Water and air temperature across the year.
WaterAirDryShoulderWet
Description
Banco Chinchorro is Mexico's largest platform-type reef complex — an oval bank roughly 40–47 km long and up to 18 km wide, often billed (less verifiably) as one of the largest atoll structures in the Northern Hemisphere. It lies far offshore from the villages of Mahahual and Xcalak, reachable only by a weather-dependent open-sea crossing of 1.5–2.5 hours, and visits require an authorized operator plus a CONANP reserve fee. The headline act is the shallow lagoon off Cayo Centro, where trained handlers run tightly regulated skin-diving encounters with wild American crocodiles beside the fishermen's stilt houses, generally from June through September. The bank is also a literal graveyard of ships — Mexico's INAH has inventoried dozens of wreck sites — but diving on the historic wrecks is prohibited; the famous 18th-century 40 Cañones cannon field is visited by snorkel only. Conventional diving happens on the protected western reefs and walls and the more exposed eastern side, with 15–30 m visibility and very light dive traffic. Artisanal cooperatives still fish spiny lobster and queen conch inside the reserve, and the cays themselves are core zones off-limits to casual landing.
Highlights
What makes this dive worth the trip.
Cayo Centro hosts one of the densest documented concentrations of American crocodiles anywhere; regulated skin-diving encounters run roughly June 1 to September 30 in 1–1.5 m of clear lagoon water, with a trained handler in the water, a maximum of two guests at a time and spotters watching from a deck above.
The bank is Mexico's largest platform-type reef complex, a federal biosphere reserve mosaic of open water, seagrass, mangrove and coral reef with around 95 coral species recorded; it joined UNESCO's Man and the Biosphere network in 2003, with core zones around Cayo Norte, Cayo Centro and Cayo Lobos.
Chinchorro is a true ship graveyard: INAH's underwater-archaeology inventory, running since 2006, has documented 69 submerged archaeological contexts including 42 shipwreck sites, among them the iconic 18th-century 40 Cañones cannon site found by local diver Manuel Polanco.
Marine life
22 species you’re likely to encounter on a dive here.
Dive sites
5 signature sites at this destination.
Cayo Centro crocodile encounter
The flagship Chinchorro experience: snorkel/skin-diving encounters with wild American crocodiles in gin-clear, 1–1.5 m shallows beside the fishermen's stilt houses (palafitos) off Cayo Centro. Heavily regulated — a trained croc handler is in the water, two guests maximum at a time, spotters on an elevated deck, groups capped at about six — and offered roughly June through September, weather permitting. Multi-day trips overnight in the stilt houses; this is a wildlife encounter, not a reef dive. Position approximate.
1–2 mintermediateDay boatLightVisibility 10–20 m
40 Cañones
The wreck site of an 18th-century armed sailing ship discovered by local diver Manuel Polanco, who counted 40 cannons — INAH has since inventoried 36 iron cannons, and guides report around 16 still visible alongside a large anchor and ballast stones after decades of looting. The debris field lies in roughly 2–6 m on the northwest lagoon floor. Reserve regulations prohibit scuba on the historic wrecks, so this is visited as a snorkel/freedive site. Position approximate.
2–6 mbeginnerDay boatLightVisibility 10–30 m
El Acuario
A shallow 'aquarium' of coral heads and white-sand channels on the protected western side of the bank, dense with reef fish and regularly visited by curious nurse sharks. One of the easier Chinchorro dives and a common first stop after the crossing. Position approximate.
5–14 mbeginnerDay boatLightVisibility 15–30 m
Coral Negro
A sand slope studded with big coral structures on the northeastern side of the atoll, averaging around 20 m. The eastern flank is the exposed side of Chinchorro — more wind, swell and current — so it suits divers with some experience; the reward is large, healthy coral architecture and abundant fish life. Position approximate.
14–24 mintermediateDay boatModerateVisibility 15–30 m
Santa Teresita
A steep but relatively shallow coral wall (to about 18 m) on the sheltered side of the bank, popular for its density of life: moray eels, spiny lobster, groupers, parrotfish, turtles and the occasional shark along the drop. Position approximate.
8–18 mintermediateDay boatLightVisibility 15–30 m
Where to dive & stay
Local dive centers, resorts, and hotels.
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Verified dive centers, resorts, and hotels around Banco Chinchorro will list here — pricing, photos, and direct contact.
