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What causes the beaches in Maldives and Sri Lanka to glow? Bioluminescence is the reason for these glowing beaches. Bioluminescence is the emission of light by a living organism. There aren't many species that have bioluminescence abilities. The Maldives and Sri Lanka are the hosts to one of these species: bioluminescent plankton. The plankton glows when disturbed; this can be by waves crashing into the beach or someone throwing a rock into the sea. This disturbance causes the plankton to have a chemical reaction that creates light. A blue/green light released by the plankton creates an otherworldly experience and highlights the beauty and diversity of the marine life in the Indian Ocean. Although it is possible to witness this wonder at all times of the day, it is most visible and memorable at sunset and nighttime when the bioluminescent plankton can show off their magic.