The DER below is from the expedition to Cuba that began on March 8, 2017.

Upon leaving Isla de la Juventud, we sailed in a westerly direction within the Canarreos Archipelago towards one of the remote coralline islands, or keys, making up this group. Cayo Largo is a 15-mile-long island that does not have a permanent local population but does house a few tourist villages and their workers. The shores are lined with mangroves forests, an important Cuban ecosystem, and beaches of fine white sand formed by the grazing of parrot fishes on the surrounding reefs.

A local boat named Ballenatos picked us up from the Panorama II to take us ashore here, where we spent some time wandering the sandy streets, visiting a sea turtle rescue center and even a small medical clinic. We then split into two groups: some of us opting to travel to the edge of the reef fringing the island for some spectacular snorkeling, others opting to take a local boat to the nearby Playa Sirena, for some swimming in warm, tranquil waters, or strolling along the picturesque beach.

Although the Caribbean corals are less diverse than those of Southeast Asia, there are close to 70 species, and local reefs abound in both stony corals, such as elk horn and staghorn corals, boulder and brain corals, as well as soft corals like gorgonians and sea fans. Large tube and vase sponges are also characteristic of reefs in the area, and this diverse ecosystem is home to almost 500 species of fish, of which at least a couple of dozen were sighted during our snorkeling outing.

Upon returning to the ship for a late lunch, we set off once more, escorted by a small school of common dolphins and several brown boobies.