Olsberg is a town in the Hochsauerland district, in North Rhine-Westphalia, Germany. It is situated on the river Ruhr, approx. 15 km east of Mesc…Olsberg is a town in the Hochsauerland district, in North Rhine-Westphalia, Germany. It is situated on the river Ruhr, approx. 15 km east of Meschede. It is bordered by Arnsberg Forest Nature Park, on the northern fringe of the Rothaargebirge. The town's setting is dominated by heavily wooded ridges and valleys formed by the Ruhr and three of its tributaries.