The railway is scenic, with parts travelling through the Cambrian Mountains or along the Cambrian Coast.
Exercise Cambrian Patrol is an annual international military patrolling exercise that makes its participating units cover a 50-mile (80 km) course in less than 48 hrs while performing numerous types of military exercises placed throughout the rugged Cambrian Mountains and swamp lands of mid-Wales.
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Its source is in the Cambrian Mountains and it flows south-westerly via the settlements of Caio and Crugybar until it joins the River Cothi around 2 km east of Llansawel.
It traverses Wales from the north coast to its south coast and is purposely routed over the highest upland and mountainous terrain including Cadair Idris, Snowdon, the Cambrian Mountains and the Black Mountains in the Brecon Beacons National Park.
Cambrian Patrol was first set up more than 40 years ago, by a group of Welsh Territorial Army soldiers who designed the training event to feature long distance marching over the Cambrian Mountains culminating in a shooting match on the Sennybridge training area.