Tyrrau Mawr

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Tyrrau Mawr\Craig-las
Tyrrau Mawr from Llyn Cregennen
Highest point
Elevation661 m (2,169 ft)
Prominence103 m (338 ft)
Parent peakCadair Idris
ListingHewitt, Nuttall, HuMP
Language of nameWelsh
LocationGwynedd, Wales
Parent rangeCadair Idris
OS gridSH711130
Topo mapOS Landranger 124, Explorer OL23
Easiest routeHike

Tyrrau Mawr or Craig-las is a subsidiary summit of Cadair Idris in the Snowdonia National Park, in Gwynedd, northwest Wales. It lies to the west of Cyfrwy, and can be climbed by taking a west bearing from the Pony Path at Rhiw Gwredydd. Its north face is a crag, known as Craig-las. Below the crags lies Llyn Cregennen with its small island. The reflection of Craig-las from this lake is one of the famous images associated with Snowdonia.

The summit is grassy and marked by a few stones. To the east of the summit lies the large ancient cairn, Carnedd Lwyd. It is often climbed in combination with Craig-y-llyn.[1]


  1. ^ Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.

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Coordinates: 52°41′58″N 3°54′25″W / 52.699428°N 3.907032°W / 52.699428; -3.907032