El Acuario (Rose Cay) and neighboring Haynes Cay are the signature shallow-sandbank snorkel spots of San Andrés, Colombia's 'sea of seven colors.' The water between the two cays is only knee- to waist-deep (roughly 0.5–1.2 m, with nearby areas around 3 m), so you can wade or float across while watching stingrays, starfish and clouds of tropical fish over the sand. Visibility runs an excellent 15–25 m inside the UNESCO Seaflower Biosphere Reserve, and because it needs nothing more than a mask and snorkel it stays a beginner- and family-favorite, and a busy must-stop on San Andrés boat tours as of 2026.
Crystal-clear knee-deep sandbank lagoon - you can literally walk or swim between El Acuario and Haynes Cay
Stingrays (locally called 'manta rays') gliding over the sand, plus resident starfish
Colorful reef fish massing around the small coral patches along the sand strip
Easy to combine with a full-day island-hopping boat tour (about 7 hours) taking in Rocky Cay and Johnny Cay
December–April dry season delivers the calmest, clearest water for viewing and photos
Good to know
SafetyA current runs through the channel between the cays and strengthens noticeably after about 3 pm. It looks shallow, but you can be pushed toward the deeper side or open water - keep children and beginners out of the late-afternoon tide and don't drift out alone.
SafetyBoats come and go roughly every 40 minutes right here. Stay inside the marked swim zone and keep a buoy or float so you're visible on the surface.
SafetyIt's easy to step on a sand-buried stingray, a sea urchin or coral rubble. Wear reef shoes and shuffle your feet along the sand so you don't startle a ray.
SafetyThere's almost no shade and the tropical sun is intense; long spells floating in the water bring sunburn, heat exhaustion and chill together. Wear a rash guard and hydrate often.
RulesThis sits inside the Seaflower Biosphere Reserve (a marine protected area). Do not touch, kick or stand on the coral, and use reef-safe sunscreen.
MannersThe stingrays are wild animals. Touching or grabbing them for photos is prohibited by the islands' environmental authority. Keep your distance, never feed them, and don't lift starfish out of the water (it can kill them).
CautionWatch for unlicensed boats and inflated 'guide' fees. Agree the round-trip price and timing before boarding, and bring your own snorkel gear for hygiene where you can (local rental is about 10,000 pesos).
Practical info
It's about a 15-minute boat ride from the downtown Spratt Bight dock in San Andrés, with departures generally from 8 am to 3 pm; you can also reach it on a full-day island-hopping tour (around 7 hours). High season, weekends and holidays get very crowded, so go early and avoid heading back after the strong 3 pm tide. Confirm current fares, boat schedules and any environmental fee just before you go.
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