Bio Bay

The Bioluminescent Bay (also known as Puerto Mosquito, Mosquito Bay, or "The Bio Bay"), is perhaps the world's largest and brightest[citation needed]. The luminescence is caused by micro-organisms (dinoflagellates) which glow whenever the water is disturbed, leaving a trail of neon blue. A combination of factors create the necessary conditions for bioluminescence: red mangrove trees surround the water (the organisms feed off the dead leaves); a complete lack of modern development around the bay; the water is cool enough and deep enough; and a small channel to the ocean keeps the dinoflagellates in the bay. This small channel is the result of Spanish ships' attempts to choke off the bay from the ocean's waters. The Spanish believed that the bioluminescence they first encountered was the work of the Devil and tried to block the ocean's waters from entering the bay by dropping huge boulders in the channel. The Spanish only succeeded in preserving and increasing the luminescence. Kayaking is permitted in the bay and can be arranged through local vendors. Swimming is allowed on limited basis through guided tours.