The TGO Challenge is an annual organised but self-managed crossing of Scotland from West to East. Participants organise their own routes, and carry whatever supplies that their route requires for completion. The distance is 320km (200 miles) or so depending on chosen route. There are a bunch of defined start points on the West Coast, and the participants can chose their own finish point on the East coast, anywhere between Fraserborough and Arbroath. Once reaching the coast, all paths lead to Montrose, where Challenge Control is maintained.
I chose to walk solo, and to start at Strathcarron and finish at Dunnotar Castle, just south of Stonehaven. I had a great trip and was blessed with mild and sunny weather most of the way. Many days I saw very few or no Challengers, but as I neared the popular 'pinch points' of Cannich, Drumnodrochit, Braemar and Tarfside I bumped into Challengers everywhere!
This is a unique event in the world of long distance walking. It's great fun, a real challenge to plan and complete and a great opportunity to meet like minded walkers from all over the planet. (well, mostly UK, but there is always a contingent of overseas Challengers)