Kerið, a volcanic crater lake located in the Grímsnes area in south Iceland, is one of the most visually stunning geological wonders in the country. This vibrant blue gem, which is part of the Western Volcanic Zone that includes the Reykjanes peninsula and the Langjökull Glacier, is a mere 6,500 years old – making it one of the three most recognizable volcanic craters in Iceland. The caldera is approximately 55 m deep, 170 m wide, and 270 m across, and is made up of a unique red volcanic rock.