|Primary factor [m]||
Approx. point 30 U 437045 5860771 - located north/north-east, on the south side of Llyn Trawsfynydd Reservoir.
|Secondary factor [km]||
Approx. point 30 U 437792 5839668 - located south/south-east, on the north-west slopes of Cadair Idris.
|Location||UTM: 30 U 433433 5851909|
|Lat/Lon: N52°48'46.3" W3°59'15.5"|
Y Llethr is the highest of the mountains known as the Rhinogydd range, but has the least impressive appearance. For some reason there's no cairn at the true summit, but a small pile of stones a little away from the highest point.
|Main photo||Y Llethr seen from Rhinog Fawr.|
|Routes||Y Llethr, Rhinog Fach & Rhinog Fawr CCW from Cil-cychwyn|