Castle Rock of Triermain (South Crag), ThirlmereBy KMC Webmaster / April 13, 2019 Location HX92+4C ThirlmereKeswickCumbria Next Event No upcoming events Loading Map.... Castle Rock of Triermain (South Crag), ThirlmereHX92+4C Thirlmere - Keswick'.__('Events', 'events-manager').' 54.5678125 -3.0489374999999654 The south crag of Castle Rock of Triermain is sunny and quick drying; about 35m high. Some of the best known climbs are Gangway Climb(VD), Via Media(S), Direct Route(VS), Kleine Rinne(VS) and Gazebo(HVS). Upcoming Events No events in this location