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 make 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. Paradise Puerto Rico is the only website that shows real images of the glow rather than image editing effects. The first twi images in the slideshow below might be a bit blurry, but capture the real glow on a good night.


  • Carr. 987 km. Las Croabas, Fajardo

Opening hours

  • Most tour providers open after 5pm daily.


  • Very unique natural wonder
  • Only a handful bioluminescent bays in the world and 3 are in Puerto Rico
  • Once in a lifetime experience


Tell us about your experience at the Bio Bay