Carnllundain or Carn Llundain[4] is the highest elevation of Ramsey Island in Pembrokeshire, Wales.[5]
| Carnllundain | |
|---|---|
| Highest point | |
| Elevation | 136 m (446 ft)[1] |
| Prominence | 136 m (446 ft)[1] |
| Listing | HuMP[2] |
| Coordinates | 51°51′43″N 5°20′51″W |
| Naming | |
| Language of name | Welsh |
| Geography | |
St David's Head, Wales | |
| OS grid | SM6961123460 |
| Geology | |
| Age of rock | Cretaceous[3] |
| Mountain type | rhyolite |
| Climbing | |
| First ascent | ancestral |
| Easiest route | Hike |
The 136-metre (446 ft) high hill stands near the west coast of Ramsey island. The top of the hill is marked by a large cairn and a trig point.[6] On clear days it offers a view of a long stretch of Pembrokeshire coastline, Skomer Island and, across the Irish Sea, of SW Ireland.[7]
The area surrounding the hill is of archaeological interest and hosts some Bronze Age stone wall remains.[4] Carn Llundain—along with Carn Ysgubor, located near the northern shore of Ramsey Island—during middle ages offered a useful landmark to seafaring pilgrims heading to St Davids.[8]

The summit of the hill can be reached with a short waymarked diversion from the trail round the island;[7] no special hiking ability is required, but wearing proper outdoor clothing is advisable.
Carnllundain and Ramsey Island are owned and managed by the Royal Society for the Protection of Birds (RSPB).[9]
Media related to Carn Llundain at Wikimedia Commons