Dún Aonghasa Archaeological Site
Prehistoric cliff fort on Inishmore's western edge
A prehistoric cliff‑fort on Inishmore (Inis Mór) in the Aran Islands, Dún Aonghasa features concentric stone walls set above steep Atlantic cliffs. Visitors come for archaeology and sea views.
Dún Aonghasa at a Glance#
Address: Dún Aonghasa (Dún Aonghasa), Inishmore (Aran Islands), County Galway, Ireland
Website: https://heritageireland.ie/
About Dún Aonghasa#
Dún Aonghasa is a prehistoric stone fort on Inishmore (Inis Mór) in the Aran Islands, County Galway, Ireland, noted for its cliff-edge position and dry-stone concentric defenses.
The monument comprises multiple concentric stone ramparts that enclose an inner area directly adjacent to high Atlantic cliffs; the site commands sweeping coastal views and is one of Ireland’s best-known prehistoric forts. The surviving walls and their arrangement are the site’s principal features.
Archaeological evidence places construction and use in the later prehistoric period, with activity during the Bronze Age and Iron Age; the site has been subject to archaeological study and conservation work in the modern era.
Dún Aonghasa occupies a prominent headland on Inishmore in the Aran Islands off the west coast of County Galway.
- Access: A short uphill walk from the main village pier and visitor parking leads to the site, which sits on the western/cliff edge of Inishmore.
What to See#
- Concentric walls: A series of concentric dry-stone walls form the main defensive enclosures, arranged around an inner court on the cliff edge and providing the fort’s characteristic profile.
How to Get to Dún Aonghasa#
From Galway or Rossaveal, ferries run to the Aran Islands (Inishmore). On Inishmore, Dún Aonghasa is reached by bike, local minibus or a moderate walk of about 3-5 km from Kilronan village depending on the route taken.
Tips for Visiting Dún Aonghasa#
- Approach the fort from the visitor centre path that runs along the rim - the cliff edge is sheer and fences protect the viewing points.
- Book guided tours during peak season to access the interior archaeology and learn about the prehistoric context.
- Stay aware of the strong Atlantic winds; hats and loose items are at risk on the cliff-top.
Best Time to Visit Dún Aonghasa#
Best visited in late spring or early autumn for fewer crowds and stable ferry connections; summer offers the best weather but busiest conditions.
Weather & Climate near Dún Aonghasa#
Temperate climate with mild summers (peaking in July) and cold winters (coldest in January). Temperatures range from 4°C to 18°C. Abundant rainfall (1278 mm/year), wettest in December.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | 4° - 9° | 3° | 141 mm | overcast | 84% | 6.2 m/s | 0.0 low | 7.9h |
| February | Acceptable | 4° - 9° | 3° | 91 mm | overcast | 84% | 6.1 m/s | 0.1 low | 9.6h |
| March | Acceptable | 4° - 10° | 4° | 94 mm | overcast | 84% | 6.0 m/s | 0.4 low | 11.7h |
| April | Acceptable | 5° - 12° | 6° | 66 mm | overcast | 84% | 5.0 m/s | 0.8 moderate | 13.8h |
| May | Acceptable | 8° - 15° | 11° | 81 mm | overcast | 84% | 5.0 m/s | 1.2 high | 15.7h |
| June | Good | 10° - 17° | 13° | 73 mm | overcast | 84% | 4.7 m/s | 1.4 high | 16.7h |
| July | Good | 12° - 18° | 15° | 81 mm | overcast | 85% | 4.6 m/s | 1.2 high | 16.2h |
| August | Good | 12° - 18° | 15° | 100 mm | overcast | 85% | 4.6 m/s | 1.0 moderate | 14.6h |
| September | Good | 11° - 16° | 13° | 123 mm | overcast | 84% | 5.2 m/s | 0.7 moderate | 12.5h |
| October | Acceptable | 8° - 14° | 11° | 137 mm | overcast | 84% | 5.6 m/s | 0.3 low | 10.4h |
| November | Poor | 6° - 11° | 5° | 145 mm | overcast | 83% | 5.6 m/s | 0.1 low | 8.4h |
| December | Poor | 5° - 10° | 4° | 146 mm | overcast | 84% | 5.9 m/s | 0.0 low | 7.3h |
