Geltsdale & Glendue Fells

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Geltsdale & Glendue Fells is a Site of Special Scientific Interest in the North Pennines, England. It covers about 8,059 hectares, spanning parts of Cumbria and Northumberland.

Key points:
- The name Glendue likely comes from the old Cumbric language, probably meaning “dark valley” or “black valley”; Cumbric origin is considered more likely than Gaelic.
- The area is especially important for birds, and most of it is managed as an RSPB reserve for upland birds.
- It is part of the North Pennines Moors Special Protection Area, designated in 2001 under the Birds Directive.