Three nations joined forces Friday to establish what will become the second-largest nature reserve in Latin America. Mexico, Guatemala, and Belize announced the creation of a massive tri-national protected area spanning 14 million acres (5.7 million hectares) across the heart of the ancient Maya forest. The announcement came during a summit in Calakmul, where Mexican President Claudia Sheinbaum stood alongside Guatemalan President Bernardo Arévalo and Belize Prime Minister Johnny Briceño to reveal plans for the Biocultural Corridor of the Great Mayan Forest. “This is one of Earth’s lungs, a living space for thousands of species with an invaluable cultural legacy that we should preserve with our eyes on the future,” Sheinbaum said during the joint press conference. She called the move “historic.” The new reserve will encompass 50 existing protected areas across the three countries.