The source of Rawthey Gill is unclear, but is either on Knoutberry Haw or near to the East Tarns of Baugh Fell.

Moving initially northwards, the Rawthey picks up Whin Stone Gill in Uldale before skirting round Bluecaster, after which the river runs south-southwest through Cautley.

The Rawthey is joined by the Clough River, coming from Garsdale, near Dowbiggin, and, having run past Castleshaw Tower, the River Dee close to Sedbergh.

Most of the country through which the Rawthey runs is part of the historic West Riding of Yorkshire.

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