Hill data: The Database of British and Irish Hills v18.6 (CC BY 4.0)Height750.4 m2,462 ft
Grid RefSH 66131 23417
OS MapOL18OS Explorer
AreaThe Rhinogs
Near Barmouth in the Rhinogydd, Diffwys reaches 750.4 m, missing Marilyn status by just 2 m, so it is technically a subsidiary summit of Y Llethr, 2.4 km away. The highest ground is 5 m north of the trig point. Y Llethr and Crib-y-rhiw lie to the north, with Cadair Idris to the south.
New to the Pennants?Read our guide: What Are The Welsh Pennants?Rock & Ground
An exposure of the Caerdion Syncline can be seen on the north side.
Summit Weather
Our Route
Distance11.0 mi17.7 km
Ascent1,410 m4,630 ft
Time6h 40mwalking
Start & FinishSH 6739 2864Circular route, back to the same spot
DirectionsAlso on this route: Y Llethr, Rhinog Fawr, Rhinog Fach
Safety: Routes are a guide only. Carry a map and compass and know how to use them, check the weather before you go, and turn back if in doubt. You use this route at your own risk.
