Picws Du Brecon Beacons, 11 April 2010 at 11:41 hours. A lone walker stands on one of the summit points of the Bannau Sir Gaer ridge. The ridge is made up of old red sandstone whilst the cliffs were formed by glacial action Camera details: EF28-135mm f/3.5-5.6 IS USM, 1/125 sec at f / 11