Cyrniau Nod is a mountain summit in north east Wales. It is a former Marilyn, the Marilyn summit now being the nearby Foel Cedig. Its summit has the Snowdonia National Park boundary running through it. A number of rivers and streams rise from near the mountain including Afon Tanat, Afon Cedig and Nant Ystrad-y-Groes. The views from the summit are extensive, if unremarkable due to the featureless, flat moorland surroundings. The summit is marked by a small cairn surrounded by peat bog. Walking on Cyrniau Nod and its tops is made easier by a track that passes close to every top except Cefn Gwyntog. Otherwise, the walking would be tough indeed, requiring tiresome bog crossing for miles.