"The Snowdon Horseshoe is one of, if not the best ridge walk in Wales. Although there is not so much height gain as in some of the routes described, the terrain is highly interesting. The route should not be attempted by anyone with a fear of heights, since includes the knife-edge arête of Crib Goch, and for the same reason it should be avoided in high winds, and also in winter unless you are properly equipped and experienced." - From www.walk-snowdonia.co.uk

The Cuillin traverse is a 12km long, technical (up to Very Difficult in the British rating system, or lower 5th class in the US system) ridge traverse with about 3000m of ascent. In an informative article on www.ukclimbing.com local climbing instructor Jon Jones called it "the most challenging mountaineering journey in the United Kingdom".

The Paddy Buckley Round is a fell running challenge in Wales (UK) which involves traversing 47 summits over a 100km course with 28,000 feet of elevation gain. It was first completed in 1982 by Wendy Dobbs. This site has more information.