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
Solway Firth guidance. There are over of Sites of Special Scientific Interest (SSSIs) in the area, as well as national nature reserves at Caerlaverock and in Cumbria. Salta Moss is one such SSSI. On the Cumbrian side, much of the coastline is designated as an Area of Outstanding Natural Beauty. The Solway Coast AONB is split in two parts, the first runs from just north of Carlisle in a westerly direction as far as Skinburness, and the second runs from the hamlet of Beckfoot in a southerly direction past Mawbray and Allonby as far as Crosscanonby. The honeycomb worm and blue mussel