Your last stop on the Golden Circle is Kerið. This cone volcano erupted in 3500 BC. After cooling, the dome collapsed into the empty magna reservoir and then filled with water. The red-rock cavity measures 885 feet across and is 180 feet deep. Kerid is surrounded by 21 square miles of lava fields named Grímsneshraun. This marvelous crater lake is worth the small admission price. Kerið is located less than ten miles north of Selfoss on Highway 35 in the Western Volcanic Zone.