Rising on Gannow Fell, south west of the Forest of Bowland, the river flows southward, meeting the River Ribble at Ribchester.
Stydd Brook flows by Black Plantation then between Moor Nook Farm and Davies Gate, before moving through Stydd Wood.
Boyce's Brook rises at the confluence of Cowley Brook (flowing southwards from Longridge Fell) and Page Brook (draining the Spade Mill Reservoirs near Longridge and flowing east) close to the hamlet of Buckley Gate.
From there, the brook moves southeast through Buckley Wood, before skirting north around Ribchester to meet Stydd Brook under Stone Bridge.
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