The Barnacken is located about 3 km (as the crow flies) southwest of Horn, part of the town of Horn-Bad Meinberg, and northwest of the Silberbach stream, which runs in a valley in a southwest to northeast direction through Veldrom to Leopoldstal, and the transition between the Teutoburg Forest and the Eggegebirge hills.
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The river Strothe rises on the Barnacken, near the B 1 federal road, and flows in a southwesterly direction alongside the B1 from Horn-Bad Meinberg in the northeast to Schlangen in the southwest and which continues as the Thune before discharging into the river Lippe.