Glaciers can both grow in size and regress depending upon several factors of which climate and precipitation in the glaciers catchment are the most important. About 7,000 years ago, the Pleistocene ice from the last Ice Age over Iceland disappeared almost entirely, so the current glaciers in Iceland are not that old. The glaciers are relevant enough in Icelandic geography that the four largest are represented blank in most of the maps of the
administrative divisions of Iceland smaller than the regions. Iceland is losing ice due to
climate change. In 2008 its glaciers still covered 11% of the land area of the country, at about out of the total area of . this was down to 10%.
Okjökull in Borgarfjörður, West Iceland, has lost its glacier title and is now simply known as
Ok, losing the
Icelandic word for
glacier,
jökull, as a suffix. In order to fit the criteria glaciers need to be thick enough to sink and move under their own weight, which any ice remaining of Okjökull can not do. Okjökull is the first Icelandic glacier to lose this title in an official manner, but tens of smaller glaciers have disappeared up to 2019. ==Largest glaciers by surface area==