Selfoss is a town in southern Iceland on the banks of the Ölfusá river. It is a part of, and the seat, of the municipality of Árborg. The Icelandic Ring Road runs through the town on its way between Hveragerði and Hella. The town is a centre of commerce and small industries with a population of 6,934 (2016), making it the largest residential area in South Iceland.
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