Os is situated by the south tip of the lake Rusken, where the historical Nydala Abbey is also situated at the lake-shore. The community is founded around a mill that produced energy for the iron production from 1600. In 1893, it was converted to a paper pulp factory, which operated until 1978. The old factory is now a museum and the manor house is a tourist attraction. Since the paper mill closed, the population has shrunk to around 100 people. Many foreigners own former small residential houses in the area for vacation needs.