Whether you call it Mosquito Bay, Bahía Bioluminiscente or something else, the bioluminescent bay on the Puerto Rican island of Vieques is the world’s brightest. The Guinness Book of World Records says so.
The glow comes from dinoflagellates, which are not actually rare. They’re a type of plankton and are found in most ocean water. What makes Mosquito Bay special, however, is how concentrated they are there.