Bioluminescent Bay (Bio Bay) Fajardo

The bioluminescent Laguna Grande or Bio Bay, located in a natural reserve on the Northeast tip of Puerto Rico, is the host to a unique natural experience. This pristine ecosystem teams with astonishing marine life, inhabiting a secluded lagoon protected by mangrove forests. The water comes alive with millions of glowing organisms that must be seen to be believed! These microorganisms are known as plankton and is best experienced at night during a "New Moon" and low tide, so mane sure you plan your visit accordingly. Experience this unusual nighttime phenomena, as you glide along in your kayak and every paddle stroke will illuminate the water around you. On a really good day you even see the mangrove roots and swimming fish glowing. Contact Paradise Tours PR to help you getting a reservation to experience this incredible unique wonder of nature.

The real glow

Paradise Puerto Rico is the only website that shows you REAL pictures of the glow on the Internet. The pictures we highlighted here are real and therefore slightly blurry.

bio bay puerto rico
bio bay croabas

Make the water glow

On good days you see the fished generating glow, the roots of the mangrove trees from the running water of the current and of course, your hand and feet when you play ion the water. 


Rd 987, Km 5
Las Croabas
Fajardo, 00738


Why you should go
- Very unique natural wonder
- Only a handful in the world and 3 in Puerto Rico
- Once in a lifetime experience

What to bring
- swim suite
- natural bug repellent
- long sleeves for protection
- changes of clothes in case you get wet

Opening Hours

Most Bio Bay Tour Companies open after 5pm. 

Tell us about your experience at the Bio Bay