La Francesa

A giant stride puts you over open sand, and the current does much of the work of the descent as the group settles onto a set of low coral ridges running parallel to the shore. Divers pick a side of a ridge and stay with it, checking the holes along the way for the resident splendid toadfish while black grouper and turtles pass overhead and permit cruise above the reef. Between the coral heads, the sand strips hold southern stingrays, blennies and urchins. Because the reef breaks into patches instead of one continuous wall, a guide can extend the dive onto a neighbouring section of the same stretch depending on where the boat starts. Most trips close on a shallower shelf to make the most of no-stop time.

Low coral heads break a broad sand strip into a line of small patches rather than a continuous ridge, and this reef trades wall drama for close, patient looking: shrimp tucked into anemones, sea slugs on the coral, and the endangered splendid toadfish denning in the reef's holes. Several independent operators sell it explicitly as a relaxed second tank in its own right, prizing that close looking over big topography. Cozumel remains the toadfish's stronghold, though its confirmed range now reaches north to Isla Mujeres and south into Belize.

This is a macro dive first. A wide-angle lens finds little drama here, but a diver who works slowly over the anemones and reef holes is rewarded with lettuce sea slugs, shrimp and the toadfish itself, most often found by scanning the holes along the ridge, not by swimming past them. Southern stingrays and moray eels reward the same patient pace over the sand strips between coral heads.

Current is mild to moderate here, and a stronger-than-typical day still calls for standard drift discipline: stay with the guide and do not fight the flow. The reef also holds a swim-through worth asking your guide about, though it is not something every operator runs into on this dive. Night diving is genuinely run here, not just permitted on paper. Access is boat only, roughly 15 minutes from town on one operator's own account, and boats share this stretch of reef line with the sites either side of it, so surface with your own SMB and ascend with the group.