Bioluminescent bays are natural water bodies that glow in the dark due to the presence of tiny organisms called dinoflagellates. When disturbed, these microorganisms emit light, creating a stunning visual effect. This phenomenon is often seen in warm coastal areas, where the right conditions allow these organisms to thrive. One of the most famous bioluminescent bays is Mosquito Bay in Vieques, Puerto Rico. Visitors can kayak or swim in these glowing waters, experiencing the magical light show firsthand. The brightness of the glow can vary based on factors like water temperature, salinity, and the concentration of dinoflagellates.