Passe en S

Dzaoudzi · Petite-Terre · Mayotte

Mayotte sits inside one of the largest lagoons on the planet, a double barrier reef encircling a volcanic island in the warm heart of the Mozambique Channel. The reef is breached by a handful of passes connecting the sheltered lagoon to the open Indian Ocean, and Passe en S is the most celebrated. Its name comes from the sinuous S-shaped curve the channel traces through the coral wall, a natural chicane that accelerates tidal flow and concentrates marine life into a corridor barely a hundred metres wide. The boat dropped us at the outer mouth on a rising tide in September. Visibility stretched beyond thirty metres as we descended along the right wall. The coral here is in remarkable condition. Massive table corals extend from the wall in overlapping tiers, their surfaces dusted with damselfish that scatter and reform like living confetti. Staghorn thickets fill every ledge, and deeper sections host black coral trees draped in crinoids. At fifteen metres the current found us, not violent but insistent, carrying us around the first bend without effort. A whitetip reef shark appeared on the sandy bottom, turned lazily, and let the current carry it alongside us before peeling off into a crevice. Ahead, a cleaning station attracted a queue of Napoleon wrasses, their thick lips and bulging foreheads unmistakable even at distance. The second bend opened into a wider amphitheatre where the depth dropped to twenty-five metres. Here a reef manta ray was circling, wings tipped upward as it banked through the current. It completed three passes above us, close enough to see the remoras on its belly, before gliding toward the lagoon. Green turtles rested on ledges throughout the pass, so common that by the end I had counted eleven. As the current slowed in the lagoon shallows, schools of giant trevally hunted along the reef edge. The safety stop was spent drifting over a seagrass bed where a spotted eagle ray foraged, its wings stirring small clouds of sand.