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Gelli-nedd Hillfort is a prehistoric fortified settlement situated in Wales on bedrock of Dinantian limestone, sandstone and mudstone. The hillfort occupies a naturally defensible position on this ancient geology, where the underlying limestone formations provided both structural stability and raw material for construction. The site is protected as a scheduled monument under Cadw's reference BR248, reflecting its archaeological significance.
The hillfort belongs to the iron age tradition of hillforts that emerged across Britain during the first millennium BC. These fortifications typically comprised one or more concentric banks and ditches that exploited natural topography to create formidable defences. The limestone bedrock at Gelli-nedd would have presented particular challenges and opportunities for the hillfort's builders, who would have needed to excavate ditches through hard rock whilst adapting their defences to the uneven terrain.
As a Cadw-protected monument, Gelli-nedd remains a valuable record of prehistoric settlement and land use in Wales. The site contributes to broader understanding of how communities during the iron age selected and fortified hilltop locations, integrating local geology into their defensive strategies. The limestone landscape surrounding the hillfort continues to shape the site's character and survival.
Gelli-nedd Hillfort is a scheduled monument protected by Cadw under reference BR248. View the official record →
Gelli-nedd Hillfort is a prehistoric fortified settlement situated in Wales on bedrock of Dinantian limestone, sandstone and mudstone. It is designated a Scheduled Ancient Monument by Cadw under reference BR248.
Gelli-nedd Hillfort dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Gelli-nedd Hillfort is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is BR248.
Several scheduled monuments lie within 10 km, including Glynneath Gunpowder Works (5.8 km), Craig y Ddinas Hillfort (5.9 km), Dinas Silica Mine (5.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Gelli-nedd Hillfort's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Gelli-nedd Hillfort stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.