Kerið is a collapsed stratovolcano that formed about six and a half thousand years ago in southern Iceland. Its vicinity to popular touris route 'The Golden Circle' has meant that it has become quite a popular site to visit along the way.

The crater is large, about 270 m long, 170 m wide and 55 m deep, the soil all around is red and purple and at the bottom of the caldera there's an acrylic blue lake. The whole scene looks quite like something from another planet.

Kerið is on private land, and there's a small fee for visiting it. There are scenic points on the edges of the caldera, but there are no restrictions against climbing in if you're so inclined. Leading up to the volcano is a good ashphalt road, followed by walking up a slight hill on a good track, so it should be accessible to just about anyone.