It is divided by the River Petteril into Great Blencow to the south and Little Blencow to the north.
It is a few miles to the south-east of the city centre of Carlisle and is near the River Petteril.
The source of the Petteril is near Penruddock and Motherby, from where the young river runs northeast through Greystoke, Blencow and Newton Reigny, before passing under the M6 motorway, after which the river turns north, and the motorway roughly follows the course of the river towards Carlisle.
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