| Pen Pumlumon Arwystli | |
|---|---|
| Highest point | |
| Elevation | 741 m (2,431 ft) |
| Prominence | 64 m (210 ft) |
| Parent peak | Pen Pumlumon Fawr |
| Listing | Hewitt, Nuttall |
| Coordinates | 52°28′30″N 3°44′45″W / 52.4750°N 3.7458°WCoordinates: 52°28′30″N 3°44′45″W / 52.4750°N 3.7458°W |
| Geography | |
| Location | Ceredigion, Wales |
| Parent range | Cambrian Mountains |
| OS grid | SN789869 |
| Topo map | OS Landranger 135 |
Pen Pumlumon Arwystli is the second highest summit on the Plynlimon massif, a part of the Cambrian Mountains in the county of Ceredigion, Wales.
The summit is grassy, and is marked by 3 large ancient cairns. The views include Rhos Fawr, Drygarn Fawr, Pen y Garn to the south and Aran Fawddwy, Glasgwm, Tarrenhendre and Tarren y Gesail to the north.
The longest river in Britain, the River Severn, has its source on a lower boggy plateau to the north of the summit.