Vatnajökull is Europe's largest glacier by volume, covering about 8,100 square kilometers in southeastern Iceland. It's known for its outlet glaciers like Skaftafell and Breiðamerkurjökull, which calve icebergs into glacial lakes, and for the volcanic activity beneath its ice that creates subglacial floods and geothermal features. Travelers visit to hike on the glacier itself, explore the nearby ice lagoon, and see the contrast between ice, black sand beaches, and volcanic terrain along the South Coast.