The dive sites in Negombo are divided into two locations with the closer dive sites situated within 5 to 8 Km away from the shore known as the second reef and the further “third” reef nearly 22 km away. All most all the dive sites offer a great variety of marine fauna ranging from Grouper, Sweet lips, Rays, Moray eels, Barracuda, Queen fish, Caranx and occasional sharks and dolphins.
The diving season in Negombo is open from December through April and there are 12 diving sites on the second reef to choose from, although clear water cannot be expected every day of this period due to strong currents and the presence of the nearby lagoon rich in silt .
The Diyamba Gala is a 25 meter deep off shore dive, 45 minutes away from the shore with pristine reef full of marine life, Derana Gala equal to Diyamba Gala in depth and boat time also boasts of shoals of fish while Muttian Gala is a 14 meter dive, 30 minutes away from the shore with Small rocky barrier reef with masses of reef fish and Stingrays.
Thanthiri Gala, Lobster reef, standard reef, Bandara rock, Barracuda point, Hanova, Adams peak and rote 66 are dives of 15 meter depth with 20 to 50 minutes boat time but carry a fine display of marine life from rays to moray eels to groupers.
Ahas yatra Gala is a remnant of a World War II Fighter Aircraft alongside another mound of natural reef 15 meters deep and 45 minutes away from the shore.
However the best diving spot is on the third reef , 22 km into deep sea, the last frontier of dive site, where there are No boats, no trawlers but just calm deep blue sea all around as far as eye can see.
The visibility is as deep as 25 meters from the boat with dark shoals of fish emerging and disappearing in split seconds while a school of dolphin appears above the ocean surface occasionally. Yet the best treats come as marble rays, the biggest ever observed around Sri Lanka.
For the enthusiastic wreck diver are the two unexplored ship wrecks known as Kapungoda Wreck one and two wrecked during the cyclone of 1965. The wrecks are found in shallow waters beyond the shores of Kapungoda, which are best viewed between November and March and are home to an extraordinary variety of fish, as well as large crabs and lobsters.