Fort Hammenhiel

Fort Hammenhiel — the name is Dutch for "heel of ham," a description of the islet's shape — sits on a small coral outcrop between Kayts and Karainagar, accessible only by a short boat trip from the Karaitivu jetty. The fort began as a small Portuguese guard post in the 17th century and was rebuilt by the Dutch as part of a chain of small forts that controlled the channel between the Jaffna Lagoon and the open sea.

The walls are low and the footprint is modest — this was never a major military structure, more a checkpoint on a maritime route. What survives is intact: the perimeter walls, the inner courtyard, a small chapel, and the bastion at each corner. The whole circuit is a slow ten-minute walk.

The fort is administered today by the Sri Lanka Navy and operates as a small heritage rest house. Day visits are possible by arrangement with the navy detachment at Karainagar; a handful of rooms are also bookable for an overnight stay (basic, but the experience of waking on a small fortified islet is unusual). The boat crossing is short — five minutes — and the water is clear enough to see the bottom for most of the way.

Combine with a visit to Kayts and Karainagar — old Catholic churches, palmyra plantations, and the long causeway road back to the mainland.