The Sonnenberg rises in the Rur Eifel within the High Fens-Eifel Nature Park and is entirely within the borough of Heimbach. Its summit lies 1.1 km northeast of Hengebach Castle (Heimbach Castle), which is situated in the heart of the town of Heimbach on the River Rur, and 1.2 km south-southwest of the village church of Hausen, which is further downstream. At the western foot of the hill is the village of Fischbachtal, a small settlement between Heimbach and Hausen, and about km (each as the crow flies) east lies the village of Vlatten. To the south the countryside transitions to the Eichelberg (379.1 m) hill near Heimbach. A northern spur of the Sonnenberg, towards Hausen, is called the Rensberg which, on topographical maps somewhat north of its name at almost the same spot gives the heights as 348.4 m and 346.5 m.