Cabo Pulmo National Park protects the only living hard coral reef on the western coast of North America, a 20,000-year-old ecosystem that spans 71 square kilometers of the Sea of Cortez. Declared a UNESCO World Heritage Site in 2005 as part of the Islands and Protected Areas of the Gulf of California, the reserve enforces a zero-extraction policy enacted in 1995 after local fishing families voted to end commercial harvest. Within three decades, biomass increased by 463 percent, transforming depleted shallows into one of the planet's most documented marine recovery zones. The reef structure rises from volcanic substrate between five and 25 meters depth, creating thermoclines that attract over 226 fish species, 11 shark species, manta rays with wingspans exceeding four meters, and seasonal aggregations of mobula rays that number in the thousands. Bull sharks patrol the outer walls from June through November. Humpback whales migrate through adjacent channels between January and March. The coral formations themselves — predominantly Pocillopora and Porites genera — grow at rates measurable in millimeters per year, making the visible colonies centuries old. Cabo Pulmo diving packages tours operate under strict permitting from Mexico's National Commission of Protected Natural Areas, with daily visitor caps enforced to prevent reef stress. Operators based in the village of Cabo Pulmo hold CONANP certification and maintain permanent moorings to eliminate anchor damage. The 125-peso conservation fee per person funds patrol boats and biological monitoring. Dive sites include El Bajo seamount, where schooling jacks form bait balls dense enough to obscure sunlight, and Los Morros, a boulder field where green sea turtles graze on algae alongside Cortez angelfish. Water temperature ranges from 22°C in winter to 30°C in summer, requiring 3mm to 5mm wetsuits depending on season. Visibility averages 15 to 30 meters, peaking in autumn and early winter when plankton blooms subside. The reef lies 100 kilometers north of Cabo San Lucas along a two-lane highway, with no fuel stations for the final 40 kilometers. The village itself maintains a population under 200, with no cell service and limited electrical infrastructure, preserving the isolation that enabled the fishery closure three decades prior.