Seljavallalaug

South Coast

Built into a hillside in 1923 to teach locals to swim — most made their living from fishing, yet few could actually do it — Seljavallalaug is a 25-meter outdoor pool fed by a hot spring seeping through the rock wall on one side while a cold stream runs along the other. The temperature gradient is real: warmer near the mountain, cooler toward the open end, generally 20–30°C. Algae grows freely since the pool is cleaned just once a year by volunteers, giving the water a greenish tint. There are no showers, no running water, no toilets — only a basic changing hut. From the gravel parking area at the end of Route 242, the walk in takes 15–20 minutes each way through a narrow valley beneath Eyjafjallajökull. That volcano's 2010 eruption buried the pool in ash; volunteers cleaned it by hand the following year. The valley closes steeply on three sides, giving the place a remote feel no commercial pool can replicate. Entry is free with no official hours. Bring everything: towel, change of clothes, drinking water. Budget about two hours total.

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