Wikimedia. Creative Commons. Credit: Rosino.
Visitors to Seltún will be taken aback by how much the area resembles a lunar landscape; with red, Mars-like gravel and steaming vents, the area is dotted with bubbling pools of mud, fumaroles and hot springs. There are well-maintained wooden walkways around the springs from where you can observe.
The sediments excreted by such hots pools range in colour from red, orange and green, creating a dazzling kaleidoscopic effect on the ground and surrounding hills. The reason for this geothermal activity is because of Krýsuvík's location in the middle of the fissure zone on the Mid-Atlantic Ridge.
The German scientist, Robert Bunsen, proposed his thesis on the formation of sulphuric acid after visiting the geothermal field in 1845.