Kolbeinsey

Kolbeinsey (; also known as Kolbeinn's Isle, Seagull Rock, Mevenklint, Mevenklip, or Meeuw Steen) is a small islet off the northern coast of Iceland, north-northwest of the island of Grímsey. The island is the northernmost point of Iceland and lies north of the Arctic Circle. It is named after Kolbeinn Sigmundsson from Kolbeinsdalur in Skagafjörður who is said to have broken his ship there and died with his men, according to "Svarfdæla saga". A basalt landform, devoid of vegetation, it is subject to rapid wave erosion and is expected to disappear in the near future. Erosion rate data from 1994 suggested that this would happen around 2020. , two small sections of the island remain visible during low tide.
History.
The original size of the island is unknown. When it was first measured in 1616, its size was from north to south and east to west. By 1903, it had already diminished to half that size. In August 1985, the size was given as across. At the beginning of 2001, Kolbeinsey had reduced to an area of a mere , which would correspond to the size of a circle of about in diameter. The island has a maximum elevation of .
A helicopter landing site was constructed on the island in 1989 but efforts to strengthen the island have subsided in part because of agreements with Denmark over limits. In March 2006, it was stated that helicopters were no longer able to land on Kolbeinsey. It had been found that almost a half of the helipad which was laid with concrete in 1989 had been destroyed when a large piece of rock separated from the rest of the island.
In August 2020, YouTuber Tom Scott published a video which confirmed the continued—albeit further eroded—existence of the island at low tide.
, Kolbeinsey remains easily discernable in Sentinel-2 satellite imagery in appropriate weather conditions.
Geology.
A submarine eruption was reported in 1999 near the Kolbeinsey Ridge northwest of Grímsey. Kolbeinsey is the only subaerial expression of this portion of the Mid-Atlantic Ridge. It formed during the late-Pleistocene or Holocene. Dredged glass shards indicate submarine eruptive activity during the late-Pleistocene until at least 11,800 radiocarbon years ago.