Trincomalee & Kalpitiya

The first decision is which coast the trip is actually for, since the two seasons sit almost exactly out of phase and neither can be had at full strength at once. Trincomalee's window is roughly Apr–Sep, when the east coast goes flat and centres on the beaches north of town run short boat trips out to the reefs and wrecks, with a few entries walkable from the sand. Kalpitiya works the other half of the year. Combining them means catching an edge of each season and accepting that one coast will be marginal.

East-coast diving is granite and coral in roughly equal measure. The run out to the national park island takes minutes, and because the lagoon side is given over to snorkellers the diving is done on the outer edges. Along the mainland shore, headlands carry on underwater as bare granite boulders tipping into sand, with overhangs and gullies that hold fish and carry no coral at all. Depth builds gradually, current is usually light, and the great majority of the diving stays inside recreational limits.

The wrecks are what bring experienced divers, and they are not casual dives. Most of the April 1942 losses lie down the coast toward Batticaloa rather than off Trincomalee itself, so reaching them means a dedicated trip staged from that end, though the shallower hulls fit inside a normal boat day. The carrier is another matter — deep, exposed to current, treated as a war grave, and dived by arrangement on chartered trips that need permissions and a settled sea, so plans fall through more often than they run. Identifications are not settled on every hull, and local operators are the better source on what is currently reachable.

Kalpitiya is a different sort of day: an early boat, hours on flat water out at the shelf edge, spinner dolphins in numbers and whales blowing at a distance. That is deck work rather than diving, and it fills the time either side of a reef dive rather than replacing one. The south-west monsoon wind that shuts the west coast to boats also makes the town a kitesurfing base from roughly May to October, so what you find ashore depends heavily on when you turn up. It suits divers who want a country to travel as much as a reef to dive.