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A narrow rock formation separates the Twin Lagoons, popular swimming holes filled with a freshwater-saltwater mix in Busuanga Island, Palawan.Photograph by HOLGS / Getty Images
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Named after the largest of its 1,780 islands, biodiversity hotspot Palawan is the “last ecological frontier” of the Philippines. The emerald archipelago is strung across turquoise waters, making island-hopping the best way to experience signature Palawan experiences like floating through an underground river, swimming in hidden lagoons, and diving among World War II shipwrecks.