Map sheet number OL 13 in the detailed OS Explorer Map series covers an area from Blaina in the south to hay-on-Wye in the north and allows you to explore the Black Mountains and parts of well-known National Trails and Recreational Paths which criss-cross this area. The trails and paths include the Breacons Way, Herefirdshire Trail, Offa's Dyke Path, Taff Trail, Three Rivers Ride and Wye Valley.