What is "llanfachreth"

Llanfachreth is a settlement some three miles north-east of Dolgellau (its post town) within the historic boundaries of Merionethshire (., Wales. The village is on the slopes of the valley of the river Mawddach and at the foot of Moel Orthrwm. To the south-west on another prominent hill, the Foel Cynwch, is the famous Precipice Walk.