Pathfinder: Legacy of Fire
The Chalk Cliffs
The notes from the Pathfinder Society say the Chalk Cliffs are a deep box canyon near the headwaters of the Hammerfalls. They are actually primarily limestone, cut by ancient water flows and centuries of wind. There’s some evidence the dwarves of the Hammerfalls once quarried stone from the Chalk Cliffs, and perhaps dug other mines, now used as lairs by gargoyles and other creatures that hunt in the area.