Located in the southeastern corner of Passikudah Bay, Passikudah Reef is a must-visit for diving enthusiasts. This reef offers a diverse range of hard and soft corals, as well as a variety of fish such as damselfish, butterflyfish, cardinal fish, snappers, and sweetlips. With a depth of at least 8 metres, it's an excellent spot for nighttime diving. Passikudah Reef is also home to some of the more exotic species of marine life such as the lionfish, trumpetfish, and octopus. The crystal-clear waters of the reef make it an ideal location for underwater photography and videography. For those who aren't keen on diving, glass-bottomed boat tours are available to view the stunning underwater ecosystem without getting wet.