Ammassalik Island is an island in the Sermersooq municipality in southeastern Greenland, with an area of 772 km². Ammassalik Island is located in the King Christian IX Land region. Separating Ammassalik Island from the mainland of Greenland are the wide Sermilik Fjord in the west and the Ikaasartivaq Strait in the northeast. To the east and sou…Ammassalik Island is an island in the Sermersooq municipality in southeastern Greenland, with an area of 772 km². Ammassalik Island is located in the King Christian IX Land region. Separating Ammassalik Island from the mainland of Greenland are the wide Sermilik Fjord in the west and the Ikaasartivaq Strait in the northeast. To the east and southeast, the progressively wider southern half of the Ammassalik Fjord separates the island from the remainder of the eponymous Ammassalik Archipelago. Islands in the archipelago include Kulusuk Island, across the Torsuut Tunoq sound, and Apusiaajik Island, the largest. Ammassalik Island's southern coast borders the Irminger Sea, a marginal sea of the open North Atlantic.