Jesus Centenero Mari
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One of my top spots in Martinique. If you are visiting in high season, then you should go as early as possible as this is a small beach.
Get lost snorkeling in coral area on the right side, with plenty of sealife, sponges, chimneys... also a lot of turtles.
Please do not disturb the turtles (and sea life), we are in the invaders in this natural spot, just observe and enjoy. Unluckily tourism has made an impact and there are not as many turtles as it should be.