Roman Cumbria to Wallsend on the Tyne estuary, with additional military installations running down the Cumbrian coast from Bowness to Risehow, south of Maryport, in an integrated fashion (and with forts at Burrow Walls and Moresby that were perhaps not part of the system). Historians believe that the Turf Wall from the River Irthing to Bowness-on Solway was rebuilt in stone in two stages. The most easterly five miles were rebuilt at the time of Hadrian, with the remainder being rebuilt after 150 AD. However, this is open to dispute: it is uncertain whether the building works in the second half of
River Eden, Cumbria by the River Petteril and River Caldew from the south, as it winds through Carlisle. Its junction with the River Caldew in north Carlisle marks the point where Hadrian's Wall crosses the Eden, only five miles before both reach their end at the tidal flats. It enters the Solway Firth near the mouth of the River Esk after a total distance of approximately . The river supports Atlantic salmon ("Salmo salar") and Eurasian otter ("Lutra lutra"). The river and its tributaries are designated a Special Area of Conservation under the European Union's Habitats Directive. The area protected by the SAC