Many fans of Columbia Games Harn go the extra mile in researching the medieval landscape. Here Chris and Andy of the Penultimate Harn Paget worked up a map of Notthingham shire as it existed in the 12th century.
If you want go crazy with all thing Harn there no better place than Bill Gant's Harnlink.
Review - Another Bunch of Content Issue #3 (OSR Supplement)
37 minutes ago