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 were designated as conservation targets in 2013, as Allonby Bay - an inlet of the Solway Firth - was put forward as a candidate for a Marine Conservation Zone. A long-distance walking route, the Annandale Way, runs through Annandale, from the source of the River Annan, in the Moffat Hills, to the Solway Firth; it was opened in September 2009. Unlike other parts of the west coast of Scotland, the Solway Firth is generally devoid of islands. However, there are a few examples: The Isle of Whithorn is actually a peninsula. The Solway Firth forms the estuary of the River