Pumlumon

Pen Pumlumon Fawr
The northern slopes of Pumlumon Fawr
Highest point
Elevation	752 m (2,467 ft)
Prominence	526 m (1,726 ft)
Parent peak	Pen y Fan
Listing	Marilyn, Hewitt, Council top, Nuttall
Coordinates	52°28′03″N 3°46′58″W / 52.4675°N 3.7828°W / 52.4675; -3.7828Coordinates: 52°28′03″N 3°46′58″W / 52.4675°N 3.7828°W / 52.4675; -3.7828
Naming
Translation	five-peaked mountain, big peak (Welsh)
Pronunciation	Welsh: [ˈpɛn pɪmˈlɪmɔn ˈvauɾ]
Geography
Location	Ceredigion, Wales
Parent range	Cambrian Mountains
OS grid	SN789869
Topo map	OS Landranger 135

Plynlimon (anglicised from in Welsh, meaning "five peaks") is the highest point of the Cambrian Mountains in Wales, and the highest point in Mid Wales. It is a massif that dominates the countryside of northern Ceredigion.

The highest point of the massif itself is Pen Pumlumon Fawr at 752 metres (2,467 ft). Its other important peaks are Pen Pumlumon Arwystli, Y Garn, Pen Pumlumon Llygad-bychan and Pumlumon Fach.

The longest river in Britain, the River Severn, has its source on the mountain, as do the rivers Wye and Rheidol.

Folklore says there is a sleeping giant in Plynlimon.

The Pumlumon area is the largest watershed in Wales and is the source of the rivers Wye, Severn and Rheidol. Since 2007 the Wildlife Trusts of Wales have been working to improve the habitat as a "living landscape" project. This watershed area has been affected by loss of biodiversity, erosion of the peaty soils' structure, and accelerated drainage. Some believe the drainage issues have contributed significantly to flooding in areas some distance downstream, though this cannot be clearly proved.

Like most of the uplands across Wales, intensive land use activities have resulted in many habitats being either lost or degraded. Over-grazing of sheep has induced soil compaction, which has resulted in increased flooding of the lowland areas. The principal land cover within the project area is dominated by a complex mosaic of locally, nationally and internationally important habitats and species, such as dry and wet dwarf-shrub heathland, blanket bog, unimproved acid grassland and a number of oligotrophic lakes. Agriculturally improved grassland, broadleaved woodlands and forestry plantation are also characteristic features of the area.