This is a fisheye view of the volcanic crater Víti at Askja taken during my second cycling tour across the interior of Iceland in August 2010.
Askja is a stratovolcano situated in the central highlands of Iceland. The Víti explosion crater, seen here, contains a geothermal lake of mineral-rich, sulphurous, intense turquoise coloured water which remains at a steady 27°C. In spite of being extremely malodorous, it is popular for bathing.
Öskjuvatn, seen in the background, is a large lake that fills much of the smaller caldera resulting from the 1875 eruption.
The figure on the left is Georg, one of my cycling companions.