Tasiilaq is located approximately
106 km (65.9 mi) south of the Arctic Circle, on the southeastern
coast of Ammassalik Island, on the shore of a natural harbour in Tasiilaq
Fjord, named Kong Oscars Havn
by Alfred Gabriel Nathorst in 1883. The fjord is an inlet of the long
Ammassalik Fjord emptying into the North Atlantic to the east of the town