The Inuit word Qeqertarsuaq means "big island" and is used for both Disko Island and the settlement on its south coast.

Disko Island is famous for its geology: on top of cretaceous volcanic and sedimentary rock there are tertiary basalts (see notes for a closer look at the layers) and the northern part of the island is one of the very few places where native iron can be found.
Apart from the geology there is also a surprisingly lush tundra vegetation usually only found in southern Greenland.

de.wikipedia.org/wiki/Diskoinsel