Southlake Moor is another biological Site of Special Scientific Interest, this one covering near the junction of the Tone and Parrett at Burrow Mump and Burrowbridge. Southlake Moor is unusual in that, when conditions in the River Parrett are suitable, it may be deliberately flooded in winter by means of a sluice in the river floodbank. Some 96 species of aquatic and bankside vascular plant species have been recorded from Southlake Moor, of particular interest is the greater water-parsnip (Sium latifolium). When the moor is flooded, large numbers of wildfowl may be present; with up to 22,000 wigeon, 250 Bewick's swan and good numbers of pochard, teal and tufted duck. Regular signs of otter are to be seen on the muddy banks of the River Parrett. The ditches on the east side of the site contain a population of the palmate newt.