There are two Cave locations which serves as a transition zones. The first links Pleasant Valley and Winding River (the latter of which is also a transition zone to Mystery Lake), while the second links the Mountain Town region and Mystery Lake.
Pleasant Valley to Winding River Edit
The long and winding tunnels coupled with the low light make navigating Cave difficult. It is highly recommended that players venturing into Cave have a light source such as matches, a fuelled storm lantern or several flares.
Mountain town to Mystery Lake Edit
This cave is only found in the story mode of The Long Dark. The tunnel has a relatively linear layout. One end is found in the south of the the Mountain Town region, and accessed via the climbing spot at the Picnic Area. The other is found opposite the Trapper's Homestead in Mystery Lake.