On the Water
Mosquito Bay (Bahía Bioluminiscente)
Vieques
Known for: the world's brightest bioluminescent bay
Mosquito Bay (Bahía Bioluminiscente) on the south coast of Vieques is recognized by Guinness World Records as the brightest bioluminescent bay on Earth. Its glow comes from a dense population of dinoflagellates — single-celled organisms that flash blue-green light when the water is disturbed — concentrated by the bay's narrow mouth, surrounding mangroves, and warm, nutrient-rich water.
The experience is best on dark, moonless nights, when every paddle stroke and fish dart leaves a trail of light. Visits are by guided kayak or electric-boat tour only; swimming is prohibited to protect the ecosystem, and sunscreen and bug spray are discouraged in the water. Tours run from the town of Esperanza.
Curated by 787daily · Verify details before visiting.