Map sheet number OL31 in the OS Explorer series covers an area of the North Pennines AONB, Barnard Castle, Alton, and Allenheads. Highlights of the area include: Hamsterley Forest, Middleton Common, Milburn Forest, Cow Green and Burnhope Reservoirs, River Tees, Teesdale, River Wear, Weardale and a section of the Pennine Way.
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