Clogwyn Du'r Arddu (Welsh pronunciation: [ˈklɔɡwɨ̞n ˈdɨːr ˈarðɨ̞], translates as the "black cliff of the black height"),[2] is a north-facing rhyolite set of cliffs located on the northern flank of Snowdon mountain.

Clogwyn Du'r Arddu is considered to be one of the best traditional climbing areas in Britain,[1][2] and has been called "The shrine of British climbing",[3] and a "crucible for the development of most of the finest climbers in Britain and the scene of many of their finest achievements".

[2] Since these early ascents, the cliff came to attract leading British rock climbers of every era including: Colin Kirkus (Great Slab 1930, and Chimney Route 1931 with J. Edwards, Curving Crack 1932), Joe Brown (The Boulder 1951, Llithrig 1952, The Corner 1952, Shrike 1952, November 1957), Don Whillans (Vember 1951, with J.

Brown), and John Menlove Edwards (Chimney Route 1931 with C. Kirkus, and Bow Slab 1941).

[3] In 1986, Johnny Dawes eventually freed the route and called it Indian Face, which at a grade of E9 6c, was considered one of the most dangerous and difficult traditional rock climbs in the world.