It lies at the southern foot of Blencathra, one of the more prominent fells in the northern Lake District, and to the north of the River Glenderamackin.
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The beck has its beginning as an outflow of Thirlmere, whence it flows northwards through St. John's in the Vale, towards Threlkeld, where it meets the River Glenderamackin to form the River Greta.