To the left is Llyn Cwmffynnon the source or head of the Nantygwryd river (originally Y Mymbyr), which flow into Llynnau Mymbyr at Capel Curig.
The river feeding the lakes is the Nantygwryd (or Nant-y-gwryd), which has its source at Llyn Cwm-y-ffynnon, also marked on maps as the Nant Gwryd, which is a tributary of the Afon Llugwy.
Pobol y Cwm | Llŷn Peninsula | Tal-y-llyn | Ffynnon Lloer | Tal-y-llyn, Gwynedd | Llyn-y-foel | Llyn Celyn | Cwm, Llanrothal | Ysgol Gyfun Cwm Rhymni | Tal-y-llyn, Anglesey | Llyn y Fan Fach | Llyn Padarn | Llyn Mair | Llyn Geirionydd | Llyn Cwm-y-ffynnon | Llyn Cerrig Bach | Llyn Arenig Fawr | Llyn Alwen | Llŷn | Cwm Twrch | Cwm Penmachno | Cwm Idwal | Craig y Llyn |
The Papur Bro, the local Welsh language paper, is called Y Ffynnon (The Source/Spring).
It is thought to be the inspiration for "Ffynnon Garw", the fictional mountain (or hill) featured in the book, and later, film, The Englishman Who Went Up a Hill But Came Down a Mountain by Christopher Monger.