Y mae Pentreuchaf wedi ei leoli tua .5km i'r dde oddiar y briffordd B4354, y lon o Y Ffôr i Nefyn, a 2km ir gogledd o Llannor.

The village of Pentruchaf lies about .5km south of the B4354, Nefyn to Y Ffôr road, and 2km north of Llannor.