Palatinate Forest
The Palatinate Forest (, ), sometimes also called the Palatine Forest, is a low-mountain region in southwestern Germany, located in the Palatinate in the state of Rhineland-Palatinate. The forest is a designated nature park () covering 1,771 km and its highest elevation is the Kalmit (673 m).
Heiligenberg Tunnel
The tunnel is located in the northwest of the Palatine Forest ("Pfälzerwald"). It is located mainly on the urban area of Kaiserslautern; the smaller, eastern part is in Hochspeyer. The tunnel passes through the Heiligenberg mountain without a curve.