Afon Dwyfor
Afon Dwyfach
Afon Erch
Afon Soch
Afon Rhyd-hir
Afon Penrhos

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Afon Penrhos

Cors Geirch is a large marshy area in the centre of the peninsula and lies between the hills of Garn Fadryn and Garn Boduan. The Afon Penrhos drains from this marsh to the south, whilst to the north a smaller river/stream also drains from the marsh into the sea at Aber Geirch near Porth Dinllaen.

So from here the Afon Penrhos flows through Rhyd-y-Clafdy and south towards Carreg-y-Defaid, where it would have once flowed into the sea. The previous estuary was blocked in by the Victorian embankment that was built to the tramline from Pwllheli to Llanbedrog. The shoals out in the bay are remains of the flat inter-tidal beaches and bars that would have stretched further inland towards Pen-y-Berth.

Since it's previous course was blocked the river has been diverted, and now runs northeast towards Pwllheli and runs into the Afon Rhyd-hir by the A497/A499 roundabout to the west of Pwllheli.