Avallersuaq, old spelling Avatdlerssuaq, is an uninhabited island of the Cape Farewell Archipelago in Kujalleq municipality of southern Greenland.

Avallersuaq

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Geography
Location	Irminger Sea Southern Greenland
Coordinates	59°49′N 43°35′W / 59.817°N 43.583°W / 59.817; -43.583
Archipelago	Nunap Isua Archipelago
Adjacent to	North Atlantic Ocean
Area	4.30 km2 (1.66 sq mi)
Length	5.2 km (3.23 mi)
Width	2.0 km (1.24 mi)
Highest elevation	491 m (1611 ft)
Highest point	Puto
Administration
Greenland
Municipality	Kujalleq
Demographics
Population	0 (2023)
Pop. density	0/km2 (0/sq mi)
Ethnic groups	none

It is a small and rocky island located east of Itilleq Island (Egger). It has an elevation of 491 metres (1,611 ft).^[1] The small Saningassoq group of five islets lies to the north.^[2]