La Parguera Nature Reserve is a protected area located in the southwestern Puerto Rico, primarily in the municipality of Lajas but also covering cays and islets under the municipal jurisdictions of Guánica and Cabo Rojo. The nature reserve is itself a unit of the Boquerón State Forest and it protects the Bahía Montalva mangrove forest in addition to mangrove bays, salt marshes and lagoons located along the coast of the Parguera barrio of Lajas, including its numerous cays and coral reefs. The reserve is mostly famous for its bioluminescent bay, locally called Bahía Fosforecente,, one of the three of its kind in Puerto Rico and one of the seven year-round places where bioluminescent can be seen in the Caribbean.