The red walls
Volcanic rock of a colour rare in Iceland.
Gerd Eichmann — CC BY-SA 4.0 · Diego Delso — CC BY-SA 4.0 · Diego Delso — CC BY-SA 4.0 · Progresschrome — CC BY 3.0
Yes: directly on the route, costing twenty minutes and a token fee — an easy addition that complicates nothing.
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A red crater with a turquoise lake at its floor: Kerið is an oval volcanic crater fifty-five metres deep and two hundred and seventy across, about six and a half thousand years old — its walls of dark red volcanic rock, unusual in Iceland, making the contrast with the blue-green water below striking, especially with green growth on the slopes in summer. Its formation was unusual: it did not explode but collapsed — a cone emptied its magma chamber and its roof fell inward, and the water at the bottom is not rain but the water table itself. A path circles the upper rim in ten minutes, and steps descend to the lake shore. It sits on the road between Reykjavik and Geysir, so it is usually added to the Golden Circle with no real detour — and is its cheapest, quickest stop.
Volcanic rock of a colour rare in Iceland.
The water table itself, not rainwater.
Grímsnes, Iceland