One small river flows out and joins the Afon Ogwen river at Pont Pen-y-Benglog near Ogwen Cottage, immediately above the Rhaeadr Ogwen waterfall.
A small river emerges from its source and joins the Afon Ogwen river at Pont Pen-y-Benglog, close to Ogwen Cottage, just upstream of the Rhaeadr Ogwen waterfall.