Banco Chinchorro is a protected marine reserve located about 35 km (22 miles) off the coast of Mahahual. It's the largest atoll in the Northern Hemisphere and the second largest in the world - truly a bucket-list destination for divers. Since 1996, it has been a federally protected biosphere reserve, making it one of the best-preserved underwater ecosystems in Mexico. It's like traveling back in time - untouched coral formations, crystal-clear waters, and incredible marine life encounters.