Cumberland Valley, 75 mi (121 km) long and from 15 to 20 mi (24–32 km) wide, part of the great Appalachian valley, between the Potomac and Susquehanna rivers, W Md. and S Pa. It is a fertile farming area that is becoming urbanized. Chambersburg and Carlisle, Pa., and Hagerstown, Md., are in the valley.
"Cumberland Valley." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (January 22, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cumberland-valley
"Cumberland Valley." The Columbia Encyclopedia, 6th ed.. . Retrieved January 22, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cumberland-valley