One of Iceland’s best-known volcanic craters, Kerið (kerid.is; 600kr) is a 6500-year-old magma chamber that collapsed, leaving vivid red and sienna earth surrounding an ethereal green lake. It’s 16km northeast of Selfoss and is the most striking of several crater lakes in Iceland’s western volcanic zone. Much of Kerið is made of rich, red volcanic rock, but its least steep slope is a bed of mossy green during summer. Hints of yellow are a reflection of the land's sulfur content.
You can walk around the lake – Björk once performed a concert from a raft in the middle of it – in about 30 minutes or walk from the viewing platform down to the lake in about 15 minutes.
