Porta Westfalica is situated on the right bank of the Weser (except for the Barkhausen quarter), near the Porta Westfalica gorge, where the river runs through the passage between the mountain chains of the Wiehen Hills in the west and the Weser Uplands in the east. The gorge appears like a gate to the region Westphalia, which lies to the south of it. It is overlooked by the Jakobsberg and Wittekindsberg hills.