From List of National Natural Landmarks, these are the National Natural Landmarks in Puerto Rico. There are 5 in total.[1]
| Name | Image | Date | Location | Municipality | Ownership | Description | |
|---|---|---|---|---|---|---|---|
| 1 | Baño de Oro Natural Area | Río Grande | Federal (United States Forest Service) | The only contiguous area in Puerto Rico that contains subtropical wet forest, rain forest, dwarf forest, and Pterocarpus. Part of El Yunque National Forest. | |||
| 2 | Cabo Rojo | Cabo Rojo | Territorial (Puerto Rico Department of Natural and Environmental Resources) | An excellent example of a tombolo with two sand spits. | |||
| 3 | Mona and Monito Islands | Mayagüez | Territorial (Puerto Rico Department of Natural and Environmental Resources) | Caves on these islands are some of the most extensive flank margin caves in the world. | |||
| 4 | Puerto Mosquito | Vieques | Territorial (Puerto Rico Department of Natural and Environmental Resources) | Considered the best example of a bioluminescent bay in the United States. | |||
| 5 | Utuado | Territorial (Puerto Rico Department of Natural and Environmental Resources) | An excellent example of karst topography with numerous sinkholes and well-developed tower karst. | ||||