Selfoss is an urban Settlement in Árborg Municipality, in the region of Southern, Iceland. Selfoss lies at 9 m above sea level, 2.0 km from the Reykjanes peninsula mountains. It has 11,000 inhabitants (2026). The nearest city is Kópavogur, 49 km to the west. Among the landmarks around are Knarrarós Lighthouse (12.4 km) and Hraungerðiskirkja (8.7 km). Among the natural features are Urriðafoss (15.9 km) and Raufarhólshellir (19.6 km).
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