 Tourist attractions include Dunn's River Falls in St. Ann, YS Falls in St. Elizabeth, the Blue Lagoon in Portland, believed to be the crater of an extinct volcano, and Port Royal, site of a major earthquake in 1692 that helped form the island's Palisadoes tombolo.Among the variety of terrestrial, aquatic and marine ecosystems are dry and wet limestone forests, rainforest, riparian woodland, wetlands, caves, rivers, seagrass beds and coral reefs.The authorities have recognised the tremendous significance and potential of the environment and have designated some of the more 'fertile' areas as 'protected'.