Vaadhoo (Dhivehi: ވާދޫ) is one of the inhabited islands of Raa Atoll, Maldives. The island is 140.6 km (87 mi; 76 nmi) north of the country's capital, Malé.
Vaadhoo island is famous for the 'sea of stars.' This marine bioluminescence is generated by phytoplankton known as dinoflagellates. Woodland Hastings of Harvard University has for the first time identified a special channel in the dinoflagellate cell membrane that responds to electrical signals—offering a potential mechanism for how the algae create their unique illumination.