Northernmost land in the world re-confirmed: Islands north of Greenland are icebergs

Abstract Since the 1978 discovery of an islet “Oodaaq Island” north of Greenland, then considered to be the northernmost island in the world, multiple islets have been reported and apparently disappeared with regular intervals in the permanent sea ice-covered area offshore the northernmost part of Greenland. In this paper, we report results of comprehensive investigations at all quoted positions of reported islets, with bathymetry measurements, as well as supplementary lidar, ice thickness and gravity measurements during a helicopter reconnaissance. The bathymetry measurements confirm the non-existence of all the reported islets, and the northernmost land in the world is thus confirmed to be the moraine island “Inuit Qeqertaat” (Kaffeklubben Island) at latitude 83°39′54″ N, 30°37′45 ″ W. All reported islet positions are found at ocean depths from 26 m to 47 m, with no indications of shallow banks or submarine rocks at the reported positions. It is therefore concluded that all reported islets or new islands since 1978 have been stranded icebergs, likely originating from marine-terminating glaciers near Cape Morris Jesup, and stranded for up to several years in the relatively shallow and nearly permanently sea ice-covered areas around Inuit Qeqertaat.