Biobay, Vieques, Puerto Rico. Hidden along the Caribbean coast is one of the most spectacular Bioluminescent Bays in the world. The mysterious blue-green light is created by micro-organisms which thrive in an environment uniquely suited to their needs.
Bioluminescent Bay, Salt River Bay National Historical Park and Ecological Preserve, near Christiansted, St. Croix, United States Virgin Islands - Salt River is home to one of two Bioluminescent Bays or Bio Bays on the island of St Croix (a second Bio Bay can be found at Altona Lagoon). Bio Bays are extremely rare with "only seven year-round lagoons known to exist in the Caribbean".