The brightest bioluminescent bay in the world — Mosquito Bay on Vieques Island glows an electric blue-green when disturbed, caused by microscopic dinoflagellates, and is a truly extraordinary natural phenomenon best experienced by kayak or electric boat on moonless nights.
Why It’s Worth Your Time
Mosquito Bay on Vieques has been certified by Guinness as the world's brightest bioluminescent bay — a sheltered lagoon where the concentration of Pyrodinium bahamense dinoflagellates produces a vivid blue-green electric glow when the water is disturbed by movement. Kayaking through the bay on a moonless night and watching your paddle strokes trail electric light behind them is one of the most extraordinary natural experiences anywhere in the Americas. Electric boat tours are available for those who prefer not to kayak. The bioluminescence is dimmed by moonlight — plan your visit around the new moon for maximum intensity. Access from Vieques village (Isabel Segunda or Esperanza) by taxi or rental car.
What Stands Out
- Guinness-certified world's brightest bioluminescent bay
- Kayak paddle strokes produce vivid electric blue-green light trails
- Plan around the new moon — moonlight significantly dims the effect
- Electric boat tours available for non-kayakers
- Kayak tours from Esperanza approximately $35–$45 per person