Tasiilaq, formerly Ammassalik and Angmagssalik, is a town in the Sermersooq municipality in southeastern Greenland. With 1,985 inhabitants as of 2020, it is the most populous community on the eastern coast, and the seventh-largest town in Greenland. The Sermilik Station, dedicated to the research of the nearby Mittivakkat Glacier, is located near the town.

Sermersooq is a municipality in Greenland, formed on 1 January 2009 from five earlier, smaller municipalities. Its administrative seat is the city of Nuuk, the capital of Greenland, and it is the most populous municipality in the country, with 23,123 inhabitants as of January 2020.