An essential addition to your outdoor adventure kit, the Ordnance Survey OL12 Brecon Beacons National Park Map provides directions and key information of hotspots in the western and central areas, Ardal Gorllewinol and its surrounding landscapes. About OS Explorer Maps The OS Explorer Map is the Ordnance Survey’s most detailed folding map and is recommended for anyone enjoying outdoor activities including walking, horse riding and off-road cycling. Providing complete GB coverage, the OS Explorer Map series details essential information for the great outdoors, including youth hostels, pubs and visitor information. Rights of way, fences, permissive paths and bridleways are clearly shown, ensuring you have the most up-to-date information to get the most out of your time in the countryside. OL12 Brecon Beacons National Park Map - Western and Central areas features: Rhymney Valley Ridgeway Footpath, Usk Valley Walk, Taff Trail, St Illtyd's Walk, Brecon/Aberhonddu, Merthyr Tydfil/Merthyr Tudful, Brecon Beacons National Park, Mid Glamorgan, West Glamorgan, Dyfed, and Powys.