Sønsteby is a settlement in Modum Municipality, in Buskerud, Norway. Sønsteby lies at 82 m above sea level, in the Finnemarka mountains. The nearest city is Drammen, 24 km to the southeast. Among the landmarks around are Blaafarveværket (5.5 km), Royal Palace (42 km) and Akershus Fortress (42 km). Among the natural features are Snarumselva (3.9 km) and Haugfoss (5.7 km).
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