Plynlimon research catchments: catchment boundaries

These catchment boundaries define upland catchments and subcatchments at the headwaters of rivers Upper Hafren (Severn) and Upper Gwy (Wye). They identify the area of study of the Plynlimon research catchment project.

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Field	Value
Last Updated	July 2, 2026, 19:00 (UTC)
Created	June 3, 2011, 12:22 (UTC)