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 still playing a large part in the local economy, although tourism is increasing. It has also been used for the location of films such as "The Wicker Man", which was filmed around Kirkcudbright. The Solway Coast was designated an Area of Outstanding Natural Beauty in 1964. Construction of Robin Rigg Wind Farm began in the firth in 2007. The water itself is generally benign with no notable hazards excepting some large areas of salt and mud flats, which often contain dangerous patches of quicksand that move frequently. It is recommended that visitors do not attempt to navigate them without expert