Palancar Reef: Cozumel’s Underwater Cathedral

The boat slips away from the reef-studded coast and, within minutes, the water color changes from turquoise to a startling, almost unreal, cobalt. You lean over the rail, breathing in the salt-pressed air, and the first fin-cut of a shadow — an eagle ray on patrol — disappears into a ribbon of coral. Below, the reef folds like a living canyon: boulder corals rise like cathedral buttresses, fans unfurl like stained glass, and schools of parrotfish patrol the edges. This is Palancar Reef, the reason divers and snorkelers cross the Yucatán Channel to Cozumel with an unhurried kind of reverence.