What is the best bioluminescent bay in the world?

1. Mosquito Bay, Puerto Rico. Hidden on the southern coast of Vieques, off the east coast of mainland Puerto Rico, this narrow inlet widens into a dolphin-shaped bay of mangroves that protects the brightest occurrence of bioluminescence in the world according to Guinness World Records.



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Did you know that Mosquito Bioluminescent Bay in Vieques, Puerto Rico is the brightest bio bay around the world? This recognition was awarded by Guinness World Records in 2006. Puerto Rico's three bioluminescent bays are Mosquito Bay on the island of Vieques, Laguna Grande in Fajardo, and La Parguera in Lajas.

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12 Most Spectacular Bioluminescent Bays in the World
  • Manialtepec Lagoon, Puerto Escondido, Mexico. ...
  • San Diego, California.
  • Space Coast, Florida.
  • Salt River Bay, St. Croix, US Virgin Islands. ...
  • Punta Cuchillos, Costa Rica.
  • Luminous Lagoon, Jamaica.
  • Koh Phi Phi, Thailand.
  • Cat Ba Island, Ha Long Bay, Vietnam.


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This dazzling, trippy travel wonder is Mosquito Bay, the brightest bioluminescent bay in the world. It's on the Puerto Rican island of Vieques, seven miles off the southeast coast of Puerto Rico's main island.

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1. Mosquito Bay, Puerto Rico. Hidden on the southern coast of Vieques, off the east coast of mainland Puerto Rico, this narrow inlet widens into a dolphin-shaped bay of mangroves that protects the brightest occurrence of bioluminescence in the world according to Guinness World Records.

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The bioluminescent bay in La Parguera is the only bay in Puerto Rico where swimming is allowed and it adds to the true magical experience of the bay tour. On our bio-lagoon trips you will be provided with snorkel gear so you can dive under the water and swim amongst the glittering organisms.

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The bay attracts hundreds of visitors mesmerized by its glowing waters that are activated when microscopic organisms are disturbed. But its murky waters also serve as a nursery for several species, including tiger, nurse, reef and hammerhead sharks.

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There are five bioluminescent bays in the world and three of them are in Puerto Rico. Mosquito Bay, Laguna Grande and La Parguera. The other two are located in Luminous Lagoon in Jamaica and Halong Bay in Vietnam. A bioluminescent bay or bio bay is a body of water that glows.

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“In other parts of the world, bioluminescence is seasonal,” explains Sharon Grasso, a tour guide on Vieques. “But here, the water glows brightly year-round.” Each night Grasso shows off the natural beauty of the bay.

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The brightest bioluminescent bay in the world, Mosquito Bay in Puerto Rico, is worth a visit, but it does take some planning. Let's take a look at the best time to see the water's bright luminescence and how to plan your trip accordingly.

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