Sea of Cortez Biosphere

The Sea of Cortez Biosphere, known as the "Aquarium of the World," is the premier Pacific breeding ground for blue whales, fin whales, and whale sharks, containing 695 vascular plant species and 891 fish species. This fish count is 50% higher than the second-most diverse Mexican marine site, making it denser than Calakmul (#3) in aquatic life. Jacques Cousteau's description reflects its unmatched density of marine vertebrates, including 30% of the world's cetacean species. The gulf supports a nutrient influx that is 40% greater than the average coastal ecosystem, fostering plankton blooms that sustain the largest whale shark aggregations globally.