Cardiff Border Run (United Kingdom)
Mountain, Forest, Plains, City & Coast - the entire unmarked county unitary authority boundary in one go. The route stitches together a mixture of unmarked trails, national footpath routes and road to complete the first known circumnavigation of the Welsh Capital City's Border. Previously thought to be unpassable as an entire route, the all terrain course required meticulous pre-planning combined with last minute 'on the go' revisions to counter the difficult autumnal conditions (with Storm Aiden causing complete inaccessibility to some river crossings).