98. Why was the western end of Hadrian’s Wall at Bowness-on-Solway?

Bowness represents the westernmost point at which the Solway could be forded, so extending the Wall to this point obviously protected it from being outflanked by those daring enough to attempt to cross the estuary (which cattle drovers regularly did right up into the 20th century). Its western flank was further protected by a series of towers and fortlets southwards along the Cumbrian coast as far as Maryport.

Further reading: Breeze and Dobson 2000; Breeze 2006