... is on the other side of the River Severn.

http://www.genuki.org.uk/big/eng/GLS/Owlpen/Gaz1868.html

OWLPEN, (or Oldpen), a parish in the upper division of the hundred of Berkeley, county Gloucester, 3½ miles E. of Dursley, its post town, and 5½ from the Berkeley Road railway station.