Bideford Brook, goude tremen dre reter ar Forest of Dean, a zi gouezh en aber er reter da Blakeney. On the opposite (southeast) bank the flow of the River Cam is usurped by the Gloucester and Sharpness Canal before reaching the estuary. The Lyd enters the west bank of the estuary at Lydney Harbour opposite the place where Berkeley Pill carries the waters of the Little Avon River into it.