History of Workington established on the north bank of the mouth of the River Derwent, near present-day Siddick Pond and Northside. Another fort or watchtower would have been on How Michael to the south side of the river, near present-day Chapel Bank. In 122, the Romans begin building Hadrian's Wall from Bowness on the Solway Firth to Wallsend on the North Sea. The discovery of a Roman fort around the parish church in Moresby to the south, and fortifications to the north at Risehow (Flimby), Maryport and Crosscannonby support the argument that the coastal wall extended down the whole Solway coast and formed
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