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Anse du Grand Cul-de-Sac is a beautiful lagoon located in the northeast of Saint-Barthelemy Island. The shallow and calm waters offer great visibility, making it one of the best spots to snorkel on the island. First, get ready to stumble upon green sea turtles wandering the seagrass meadows that stretch out from the beach before moving on to the vibrant coral reef.

Tortue marine à l'Anse du Grand Cul-de-Sac, St Barthélémy
Green sea turtles are Anse du Grand Cul-de-Sac’s main attraction.

How to go snorkeling Anse du Grand Cul-de-Sac?

The bay is located around 8km/15minutes from Gustavia in the northeast of Saint-Barthelemy. A parking lot is available near the beach (see map below).

Anse du Grand Cul-de-Sac snorkeling map

Water entrance for snorkeling Anse du Grand Cul-de-Sac

We advise you to get into the water at the extreme west end of the beach (on the left when facing the sea), opposite the Sereno Hotel, so you would be closer to the reef and the area where sea turtles can be found.

Anse du Grand Cul-de-Sac snorkeling exploration tips

From the beach, swim about 150m along the shore to reach the sea turtles area (see map below). Turtles can be seen just about anywhere in the bay, but this is the spot where you will have the best chance of encountering them.

Green sea turtle at Anse du Grand Cul-de-Sac
A green sea turtle at Anse du Grand Cul-de-Sac.

In this area, the depth is shallow (↕3-10ft/1-3m). The turtles found here are green turtles, which come to feed and rest on the seagrass meadows. Do not touch them and give them enough space when they come up to the surface to breathe.

If you swim another hundred meters towards the barrier, you will reach the shallow reef areas. Although the corals are in variable condition (in some places very degraded), you will see many fish: blue tangs, wrasse, grunts, and butterflyfish are in particular very common.

Anse du Grand Cul-de-Sac beach
Anse du Grand Cul-de-Sac beach.

Anse du Grand Cul-de-Sac is a popular anchorage for boaters. Use a diving flag if you go far from shore, and always keep an eye out for boats in the bay.

Restaurants and accommodation nearby

There are several resorts on the thin strip of land between the bay and the Grand Etang lagoon, including Le Barthélemy Hotel & Spa, Hotel Les Ondines Sur La Plage, and Hotel Sereno.


  • Level required Intermediate
  • Maximum depth15ft/6m
  • Water entranceFrom a sandy beach
  • LifeguardNo
  • Visitor numbersLow
  • Access costsFree

MAP Spot

These spots are accessible to anyone with basic snorkeling skills, and feeling comfortable in the water and with his snorkeling gear. You will enter the water from the shore (beach, pontoon, ladder, rocks) or from a boat. The water height in the sea entrance area is reasonable, but you will not necessarily be within your depth. Moderate currents can occur in the area, even when the sea conditions are good. The distance to swim to reach the most interesting snorkeling areas of the spot does not exceed 200 meters.

This level only apply when the spot experiences optimal sea and/or weather conditions. It is not applicable if the sea and/or weather conditions deteriorate, in particular in the presence of rough sea, rain, strong wind, unusual current, large tides, waves and/or swell. You can find more details about the definition of our snorkeling levels on our snorkeling safety page.