Gilwern Hill

Gilwern Hill is a summit in Powys, United Kingdom, with a peak elevation of 440.6 meters. The top features an embedded rock located five meters east of the triangulation point, sitting atop a distinct mound formation.

The limestone quarry nearby reveals layers from the lower and middle Ordovician period, containing fossils of trilobites including species like Meadowtownella and Bettonolithus. These discoveries show the area once lay beneath ancient seas and provides insight into life from that remote time.

Two prehistoric stone rows stand in the southern section of the hill, with each arrangement featuring stones that rise well above human height.

Bring a Landranger Map 147 or Explorer Map 200E for navigation in this area, as the terrain requires good route planning. Several walking trails connect this hill to other peaks in the region, including routes toward Great Rhos Peak.

This hill sits within the Builth Inlier, a geological formation containing uncommon volcaniclastic rocks from the early Paleozoic era. The meeting point of ancient geology and ancient human monuments creates an unusual layering of time on the landscape.

Location: Powys

Elevation above the sea: 440.6 m

GPS coordinates: 52.20000,-3.33333

Latest update: December 14, 2025 20:03