Fort Hammenhiel is a fort built around a small island between the islands of Kayts and Karaitivu of Jaffna Peninsula in Northern Sri Lanka.
Wikipedia https://en.wikipedia.org/wiki/Fort_Hammenhiel
Official Website http://amazinglanka.com/wp/hammenhiel-fort/
Address Sri Lanka
Coordinates 9°42'42.142" N 79°50'52.524" E