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Puerto Rico - Vieques

Bio bay - Courtesy of

Mosquito Bioluminescent Bay (Bio Bay)

Phone: 787-741-0800

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18.101497, -65.444162

Overview of Mosquito Bioluminescent Bay (Bio Bay)

There are only seven bioluminescent bays on planet Earth, and this one is the best. The water is filled with dinoflagellates that emit bright blue light when touched. It is visible at night, when there is a new moon (not present) or crescent shaped. A swim or paddle in these waters at night outlines your movement with blue-green light. There are numerous tour companies that are approved to take you to the bio bay.

The photos online you might find are enhanced to show what it looks like, but it is extremely difficult to get actual photos, which is why there are so few shown on this website. Best experience is to visit in person. A new trend is to offer clear kayaks, so you can see the fish move beneath you.

User Reviews

User profile for Brion H
Brion H.
"This is my second time on the bio bay. This is a 'must see' for anyone visiting Vieques. One of the best bio bays in the world, and one of the few that illuminate year round. The glowing effect is hard to describe. It's better to just visit yourself and experience it first hand."

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  • Bieque Eco Trips - Personal guided tours focused on sustainable aspects of Vieques. Enjoy paddle boarding, bio bay, snorkeling, mountain biking and kayaking. Fully insur...
  • Vieques Adventure Company - Vieques Adventure Company offers do-it-yourself island exploration options or fully-supported guided tours around Vieques Island while doing our favor...

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Random User Comments

Angelica Louise A. wrote about Cabugan Adventure Resort:

"'When they say adventure they really meant adventure because before you can reach the place you have to experience the highs and lows of the very rough road, walk to a small pathway alongside the mangroves to the small boat (during low tide that is but when it's high tide then you don't have to endure the long walk), and have to climb a few high steps to reach the resort and enjoy the spectacular view of the mountains and rivers. The beach is not that promising but staying there is worth every penny. And guess what, during low tides you can walk directly to the opposite island which is the Magic Island Resort and not just that on the other side of Cabugan Adventure Resort where the small boats usually docks there is a spot where you can swim with small fishes and enjoy the view of other small boats passing by and vast rivers and mountains. I would definitely go back to Cabugan Adventure Resort and again enjoy what the resort can offer. And by the way, the staffs there are very friendly and would treat you like family.'


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Top Reviewers (All)
Brion H. 56 
Vera H. 12 
Diane D. 10 
Kay J. 10 
Angelica Louise A. 4 

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