Diffwys

{{Short description|Mountain in Snowdonia, Wales}}

{{Use dmy dates|date=April 2022}}

{{Infobox mountain

| name = Diffwys

| photo = Diffwys.jpg

| photo_caption = Diffwys and Crib-y-rhiw from Y Llethr

| elevation_m = 750

| elevation_ref =

| prominence_m = 148

| prominence_ref =

| range = Rhinogydd

| listing = sub Marilyn, Hewitt, Nuttall

| location = Gwynedd, Wales

| map = Wales Gwynedd

| map_caption =

| coordinates = {{coord|52.79151|N|3.98716|W|region:GB_source:enwiki-osgb36(SH661234)|format=dms|display=it}}

| coordinates_ref=

| grid_ref_UK = SH661234

| topo = OS Landranger 124

|fetchwikidata=ALL

}}

{{GB summits start}}

{{GB summits entry|Name=Diffwys West Top|Height={{convert|642|m|ft|0}}|Gridref=|Status=sub Hewitt, Nuttall}}

{{end}}

Diffwys is a mountain in Snowdonia, Wales, near Barmouth and forms part of the Rhinogydd. On the north side is an exposure of the Caerdion Syncline. It is technically a subsidiary summit of Y Llethr, missing Marilyn status by 2m. It is therefore a sub Marilyn.

The summit has a trig point. To the north is Y Llethr and Crib-y-rhiw, to the east is Y Garn, to the south is Cadair Idris, and to the west is its top Diffwys West Top.Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. {{ISBN|1-85284-304-7}}.