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This is a shapefile of the coastal physiographic feature 'Ria'. The polygons represent drowned river valleys of south-west Britain. Often with a greater presence of rock and more marine in character than estuaries. This is the definition taken from Annex I habitat 1160 - Large shallow inlets and bays.
All datasets from Joint Nature Conservation Committee
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Contains public sector information licensed under the Open Government Licence v3.0
