4 - Eyri (Snowdonia) National Park - Views
Moel Hebog Trig Pillar
This "trig point" is a distinctive, weather-beaten structure on the mountain's highest point.
To the left - a dry stone wall leads down from the trig point.
The triangulation of Great Britain began on the 18 April 1936 , with usually a white concrete pillar, 6,500+ trig pillars were built.
The pillar provide a solid base for the surveyors theodolites.
Ref: NW 4794.5
Date: 21/09/2025
Location: SH 5685 4726
