Much of northern Midvale is calcareous grassland, with great spans of limestone deposits deep beneath the chalk.
It is not commonly known, there is an extensive network of caves throughout the limestone.
Students of the occult know it as Dugi Mrak, the long dark. Although broken in places by sinkholes, the caves of rathad creagach (as it was once known to the now-extinct Sandringer-descended Sedgemoorlanders) is an otherwise complete web of caves in which one could walk from Moritoan Coomb to Barcel Bay.
