The Wikipedia article on Arkengarthdale describes the area geographically and emphasizes its longstanding industry of lead-mining which appears to have ceased in the early 20th century. Population and land ownership in the dale is discussed in detail.
For more information, see the EN Wikipedia article Arkengarthdale.
GENUKI states that it contained the communities of Arkle Town, Booze, Dale Head, Eskeleth, Faggergill, Langthwaite, Plantation, Scar House, Seal Houses, and Whaw. Of these, only Whaw is named on Google Earth, although there are other unnamed buildings scattered around the moor.