San Andrés is a small Colombian coral island in the southwest Caribbean—closer to Nicaragua than to mainland Colombia—and the populated core of the UNESCO Seaflower Biosphere Reserve. Nicknamed the 'Sea of Seven Colors' for its turquoise water, it offers warm, clear, easy-to-intermediate reef and wall diving with more than 30 sites, plus nurse sharks, eagle rays, turtles and a popular wreck.
Destination info
Conditions, highlights, and the resident marine life.
Conditions
Water and air temperature across the year.
WaterAirDryShoulderWet
Description
San Andrés sits about 775 km off the Colombian mainland in the western Caribbean and forms the inhabited heart of the Seaflower Biosphere Reserve, declared by UNESCO in 2000 and one of the largest marine protected areas in the Americas. The island is rimmed by a fringing-and-barrier reef whose shallow, white-sand-floored lagoons produce the famous 'Sea of Seven Colors' palette of blues, greens and turquoise. Diving here is largely accessible: more than 30 sites range from shallow coral gardens and an easy wreck to dramatic outer-reef walls that drop past recreational limits. Water is warm year-round (roughly 27–29°C) and visibility is typically 15–30 m, best in the drier, calmer months. The reserve protects roughly 57 hermatypic coral species, 270+ reef-fish species and all four Caribbean sea-turtle species; divers commonly see parrotfish, grouper, barracuda, southern stingrays, spotted eagle rays, nurse sharks, occasional Caribbean reef sharks and green and hawksbill turtles. Like reefs across the wider Caribbean, San Andrés has been affected by mass bleaching (notably the 2023 heat-stress event) and stony coral tissue loss disease (SCTLD), and is the focus of active coral-nursery restoration and disease-treatment programs—so coral condition varies markedly between sites.
Highlights
What makes this dive worth the trip.
San Andrés is the populated core of the Seaflower Biosphere Reserve, declared by UNESCO in 2000 and covering roughly 180,000 km² of the western Caribbean—one of the largest marine protected areas in the Americas, sheltering some 57 reef-building coral species, 270+ reef-fish species and all four Caribbean sea-turtle species.
Diving here is unusually accessible: the island has more than 30 dive sites, many shallow (around 12–18 m) with calm conditions, alongside outer-reef walls that plunge past recreational limits—so the same island suits both first-time divers and experienced wall divers.
Water stays warm year-round (about 27–29°C, cooling slightly to 26–28°C in the rainy months), so a 3 mm wetsuit or shorty is usually enough; visibility is typically 15–30 m and clearest in the drier, calmer season.
Marine life
27 species you’re likely to encounter on a dive here.
Dive sites
8 signature sites at this destination.
Blue Wall
San Andrés's signature outer-reef wall, on the reef edge southwest of the island. The slope begins around 7–8 m and drops vertically past 50 m, with a swim-through canyon and a large cavern near 40 m known locally as the 'Grouper Palace.' The wall is draped in big tube sponges, gorgonians and black coral; eagle rays glide along the blue, with nurse sharks, occasional Caribbean (grey) reef sharks, large parrotfish, moray eels, lobster and turtles. Because most dives reach 30–40 m, it is reserved for advanced and experienced divers, ideally on enriched air.
8–40 madvancedDay boatModerateVisibility 20–40 m
Trampa de Tortuga (Turtle Trap)
A dramatic site on the eastern barrier-reef edge where a shallow reef shelf around 12–18 m gives way to a wall that plunges to well over 100 m. The inner shelf is gentle, with gorgonians, sponges, brain and elkhorn corals, moray eels and reef tropicals, while the drop-off attracts larger grouper, sharks and—true to the name—sea turtles. The shallow shelf is approachable for many divers, but the deep wall and exposed position mean dives are run conservatively and only the upper section is a recreational dive.
12–30 mintermediateDay boatModerateVisibility 15–30 m
Palacio de la Cherna (Grouper Palace)
An exciting wall dive on the southeast reef edge that drops from about 12 m to well over 300 m. The upper wall and ledges hold Caribbean reef sharks and nurse sharks, Caribbean spiny lobster and king crab among the sponges and corals, with grouper sheltering in the overhangs. The serious depth potential makes it an advanced site—dives are kept within recreational limits along the upper wall.
12–40 madvancedDay boatModerateVisibility 15–30 m
Nirvana
One of the most popular and approachable sites on the island, a shallow reef around 15 m on the calmer west side. A full range of hard corals, sponges and reef tropicals shelters crustaceans, octopus, pipefish and small macro life, with stingrays, turtles and occasional reef sharks passing through. Calm conditions and modest depth make it a favourite for beginners, training dives and night dives.
8–18 mbeginnerShoreLightVisibility 15–30 m
Blue Diamond (Barco Hundido)
San Andrés's most-dived wreck, a cargo ship resting at about 13–15 m off the west coast and now well encrusted with sponges and coral. The shallow depth and sheltered location make it an easy, popular dive: large shoals of grunts and snapper hover around the hull, with cleaner shrimp and moray eels in the structure and stingrays, turtles and the occasional nurse shark in the surrounding sand. Suitable for relatively new divers and accessible from boat or shore.
12–15 mbeginnerDay boatLightVisibility 15–25 m
La Pirámide (The Pyramid)
A reef and sand site on the west side reaching about 27 m, prized for its macro and critter life: anemones, nudibranchs, ghost pipefish, gobies, shrimp and crabs, with schooling snappers and grunts, eels, stingrays and the occasional nurse shark. Currents here can run moderate to strong, so it is generally better suited to experienced divers despite its modest depth.
12–27 mintermediateDay boatModerateVisibility 15–30 m
Wild Life
A west-coast reef with a sloping profile from about 12 to 27 m, named for its abundance of fish life. Sponges, gorgonians and corals cover the reef, sheltering angelfish, reef tropicals and—like much of the Caribbean—invasive lionfish (which local operators cull). Larger reef fish and the occasional shark or turtle pass along the deeper edge. The depth range puts the lower section in experienced-diver territory.
12–27 mintermediateDay boatLightVisibility 15–30 m
Cantil de Villa Erminia
A reef and wall site off the southwest of the island (also written 'Villa Erica'), where the reef edge slopes from roughly 12 m to 45 m. The site is known for passing rays—southern stingrays and spotted eagle rays—plus turtles cruising the wall, with reef fish, sponges and gorgonians along the slope. The deeper sections make the full wall an advanced dive, while the upper reef is more forgiving.
12–40 mintermediateDay boatModerateVisibility 15–30 m
Where to dive & stay
Local dive centers, resorts, and hotels.
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