On the west coast of Sri Lanka, the snorkeling at Negombo is best known for Long Reef. The Long Reef snorkeling site is located to the north of Negombo off the coast and is accessible by boat only. To avoid monsoon season, the best time of year for Long Reef snorkeling is November to April.
To reach the snorkeling in Sri Lanka by air, fly into Bandaranaike International Airport (CMB), which is also known as Colombo International Airport or Katunayake International Airport. It is located in the middle of the western coast.
Overall, Negombo is the 2nd most popular snorkel dive spot of all 8 snorkeling dives in Sri Lanka.