Operator guide with Knife Rock depth, marine life, and seasonal visibility.
Sri Lanka · Trincomalee and Nilaveli
Knife-shaped offshore reef off Nilaveli with lively fish and coral growth.
Knife-shaped offshore reef off Nilaveli with lively fish and coral growth.
Knife Rock is a knife-shaped offshore pinnacle off Nilaveli with rocky slopes, coral patches, and plenty of fish life around the outcrop. Local Trincomalee operators treat it as a straightforward boat dive for divers who are comfortable in open water and want a compact site with enough structure to keep the route interesting. It is best when the east-coast season is settled and the sea state stays calm.
Site Conditions
Safety Notes
Treat Knife Rock as an offshore boat dive and keep the plan conservative if the crew flags wind or swell.
Community notes to help plan your visit.
Scuba Diving
Best as a boat reef/pinnacle dive with a compact loop around the rock and blue water around the edges for passing fish life.
Species commonly reported at this site, with direct links into their wildlife guides.
Research estimate
Research estimate
Research estimate
Research estimate
Research estimate
Last Updated
Research Sources
Operator guide with Knife Rock depth, marine life, and seasonal visibility.
Operator site list naming Knife Rock / Mortar Rock.
Community dive-site page with local depth and coral observations.
Official tourism context for the Trincomalee / Nilaveli dive corridor.

Shallow Nilaveli reef by Pigeon Island

Pigeon Rocks shallow coral reef

Sithananne Reef is a shallow reef dive off Nilaveli.