Glen

The word is Goidelic in origin: gleann in Irish and Scottish Gaelic, glion in Manx.

[citation needed] Whittow defines it as a "Scottish term for a deep valley in the Highlands" that is "narrower than a strath".

[1] Examples in Northern England, such as Glenridding, Westmorland, or Glendue, near Haltwhistle, Northumberland, are thought to derive from the aforementioned Cumbric cognate, or another Brythonic equivalent.

The steep hills surrounding these lakes are filled with loose shale from glacial moraines.