South Milton Ley lies in a shallow coastal river valley separated from the sea by a sand bar.[1] Adjacent to this bar, the waters of the Ley are slightly brackish due to occasional tidal influence, but upstream they give way to freshwater. The main habitat at the Ley is freshwater reedbed; this habitat is scarce in Devon and is the reason for the site's SSSI status.[2]
Vegetation
The reedswamp of the lower Ley is dominated by common reed (Phragmites australis), while further upstream the vegetation contains a mixture of other tall fen species including hemlock water-dropwort (Oenanthe crocata), yellow flag (Iris pseudacorus), great willowherb (Epilobium hirsutum) and reed sweet-grass (Glyceria maxima).[2] There are also dense stands of willow (Salix) in the middle areas of these upper regions.