53°04′59″N 4°00′07″W / 53.083°N 4.002°W The Nant y Cynnyd is a small river in Gwynedd, north Wales, starting near the Pen-y-Gwryd hotel near Capel Curig. The Ordnance Survey map is not completely specific, but the river grows into Afon Glaslyn and into Llyn Gwynant.