Round the rim of Kerið

From the car park pass the ticket booth to the rim. Walk round the crater anticlockwise: south along the west side, round the low south end, up the higher east side and back along the north rim to the booth. Then take the two flights of steps down to the lake, walk the short path along the shore and climb back up the same steps to the car park.

It is 1.5 km round with 43 m of ascent; allow about half an hour. The grade is Easy: short gravel paths and steps.

Kerið is about 55 m deep and some 3,000 years old, one of a group of craters called Tjarnarhólar. Its walls are red and black scoria, and groundwater fills the lake. The rim path is loose gravel in places, with steep drops into the crater, and the steps down to the lake have no handrail and are icy in winter. Don't walk on the lake when it is frozen. The site is open in daylight.

Kerið is privately owned and charges 700 ISK per person to enter, paid at the booth; parking is free. It is beside road 35 in Grímsnes, about 15 km north of Selfoss on the Golden Circle. Strætó routes 72 and 73 stop at Borg í Grímsnesi, several kilometres away, and not every day.

Route drawn by Global Adventurer along OpenStreetMap paths (© OpenStreetMap contributors, ODbL), with figures worked out from it. Check the forecast and the ground on the day: paths change.