Palawan Province is a narrow, elongated peninsula in the southwest, known as the 'Last Ecological Frontier of the Philippines'. The Puerto Princesa Subterranean River (a UNESCO World Heritage Site) is the world's longest navigable underground river, featuring spectacular stalactites. El Nido and Coron Island are famous for their lagoons and wreck diving. Kayangan Lake boasts crystal-clear waters. The local cuisine features a seafood feast (lobster, grouper), lechon (roasted suckling pig), coconut curry shrimp, green mango juice, and coconut pie.