Segontium Roman Fort
Photo via Wikimedia Commons — licence & author.
Rome's westernmost Welsh garrison
This is a quick reference, not a full walked guide. The facts below — location, parking, grid reference and access — are maintained from our dataset, but we haven't published our own first-hand write-up of Segontium Roman Fort yet. Know it well? Help us get it right.
The excavated foundations of Segontium, the Roman fort that guarded this corner of Wales — and Anglesey's grain and copper — for some 300 years from around AD 77. You can trace the outlines of the barrack blocks and headquarters on the hill above Caernarfon, then drop down to Edward I's castle to compare two very different empires. Free and open access, it turns a castle visit into a 2,000-year day out.
Getting there
Segontium Roman Fort is in Caernarfon, Llŷn Peninsula. It's roughly 5 min (0.5 miles) from Caernarfon , and within reach of Llanberis (19 min) and Menai Bridge (23 min).
The nearest parking: On-street parking nearby on Constantine Road / A4085. Grid reference SH 485 625 — works on any OS map and doesn't need a phone signal.
Good to know
Free, open access; makes a castle day into a 2,000-year history day.
On the map
View Segontium Roman Fort on OpenStreetMap ↗, or open it in the Explore Wales trip planner to add it to a day out with drive times and offline maps.
Staying over?
Caernarfon makes a relaxed base for exploring the area — worth staying over to catch an early start or a golden-hour finish.
Browse places to stay near Caernarfon ↗ opens Booking.com — needs signalNearby places
Make Segontium Roman Fort part of a day out
Add it to a trip in the free Explore Wales planner — chained drive times, weather, campsite suggestions, and offline maps for when the signal drops.