Rising south-east of Trawsfyndd Lake , the Mawddach flows due south to Llanelltyd where it swings westwards to enter the estuary at Penmaenpool which takes it to the Irish Sea. The river has salmon and sea trout runs and also contains brown trout. It is largely private with extremely limited opportunities for the visitors.
CAIN (or GAIN)
The Cain or Gain rises to the south-east of Trawsfynydd Lake and joins the Mawddach near the Dolgellau road. It offers trout fishing.
Trawsfynydd, Merioneth, GwyneddT5 milesfrom upper reaches to PistyllcainBB DT: ATS (H. K. & P. A. Lewis, Trawsfynydd) EDEN (GWYNEDD) Rises close to the southern shore of Llyn Trawsfynydd and, with several feeding streams, gathers strength to meet the Mawddach near Ganllwyd. Access is good for anglers seeking both salmon and trout.
Ganllwyd, GwyneddTS4 miles from upper reaches to
The Wnion flows in from the east through Bont Newydd to join the Mawddach below Dolgellau. It, too, contains brown trout and attracts salmon and sea trout. There are some facilities for visitors.
Dolgellau, GwyneddTS5 miles intervening sections as indicated on permitsAB DT:ATS(Dolgellau)e Mellte. See R.Neath Monnow. See R. Wye Nant Bran. See R.Usk