Afon Gwy - United Kingdom

Basic Information
Site Name
Afon Gwy
Short name
United Kingdom
Site Manager
Site Description
UK Upland Waters Monitoring Network (UK UWMN) site. The Afon Gwy lies to the east of Plynlimon in central Wales and forms part of the headwater system of the River Wye. The catchment area is 389 ha and rises from 380 m at the sampling station to a maximum altitude of 730 m. Catchment soils are dominated by peats and stagnopodsols. The underlying geology is Lower Palaeozoic mudstones, shales and grits of the Gwestyn and Van formations, overlain in places by locally-derived glacial drift. The catchment consists of moorland grasses, notably Molinia and Nardus, with Eriophorum and the moss Racomitrium on areas of wetter land and Pteridium on the lower slopes. The majority of this grassland supports rough grazing for sheep and in summer, on the lower land, cattle. The local area is crossed with tracks used for rally testing, one of which passes through the southern edge of the catchment. Some data are managed by UK ECN Data Centre. Note: The area is the size of the catchment. Note that Afon Gwy is within the Plynlimon Experimental Catchments (see
Last modified
2023-07-28 11:07:38


General Characteristics and Status
Site Status
Year Established
Observed properties
Affiliation and Network Specific Information
UK Upland Waters Monitoring Network (UWMN_18)The affiliation of this site with "UK Upland Waters Monitoring Network" is not verified.
UK Eutrophying and Acidifying atmospheric Pollutants network (UKEAP)The affiliation of this site with "UK Eutrophying and Acidifying atmospheric Pollutants network (UKEAP)" is not verified.
Gwy flume
Gwy flume
Centroid/Representative Coordinates

Latitude: 52.4539 Longitude: -3.73202

Elevation (average)
Elevation (min)
Elevation (max)

Site information [.json]

Centroid/representative coordinates [.shp] [.kml]
Bounding Box [.shp] [.kml]
Boundaries [.shp] [.kml]