Pen Llyn is the comprehensive guidebook (topo) covering the adventurous rock climbing on the Llyn Peninsula in North Wales.  The Llyn Peninsula offers an unmatched variety of climbing from the towering sea cliffs of northern Llyn, and the awesome walls of Cilan Head and Craig Dorys, to granite outcrops, suntrap zawns, and amenable quarries. The guidebook covers nearly 700 routes from adventurous multi-pitch trad routes to a wealth of both new trad and sport climbs, offering something for everyone.  All the routes are shown on colour photo topos along with comprehensive route descriptions.  For each area there are detailed approach maps and descriptions. Published 2024 by the Climbers Club, this guidebook includes many stunning photographs.  This easy-to-use guidebook promises that climbing on the Llyn Peninsula is an accessible and unmissable experience Number of pages is 360. Size is 150mm x 210mm (A5). ISBN is 9781919643601.