River Severn

The River Severn (AUDIO: Return of the Nightmare) was a river in the south-west of England.

Following part of the river from north-east to south-west, it ran from just west of Gloucester, snaked past Frampton on Severn then continued south-west, passing between Lydney on its west bank and Sharpness on its east. (TV: The Categories of Life) The base of the river was located in Gloucestershire. (AUDIO: Return of the Nightmare)

The River Severn appeared on Mary Cooper's map of overflow camps in and around Wales. (TV: The Categories of Life)

According to Fowler, the base of the River Severn and the Azores were the only places in the world with the correct topography for wind and fog to coexist. (AUDIO: Return of the Nightmare)

Behind the scenes
Although the full name "River Severn" does not appear on the map in The Categories of Life, part of the name ("evern") does. Coupled with the village name of Frampton on Severn, we can conclude that the river shown is the River Severn. The full name of this river is later confirmed in Return of the Nightmare.