The subglacial Esjufjöll volcano rises at the upper left part of the photo above Breidamerkurjökull glacier, with its prominent medial moraines. Icebergs calved from the massive glacier can be seen floating in Jökulsárlón lake, which drains into the Atlantic Ocean (extreme lower right). Esjufjöll is located at the SE part of the Vatnajökull icecap, north of Öræfajökull volcano, and may contain a central caldera. A minor eruption in 1927 that produced a large jökulhlaup is the only known historical activity from Esjufjöll. Photo by Oddur Sigurdsson, 1986, (Orkustofnon, Icelandic National Energy Authority).