Dumsey Meadow is a 9.6-hectare (24-acre) biological Site of Special Scientific Interest in Chertsey in Surrey.It is the only piece of undeveloped water meadow unfenced by the river remaining on the River Thames below Caversham.This unimproved and species-rich meadow is grazed by ponies and cattle. The most common grasses are rye-grass, common bent, red fescue and Yorkshire-fog, and there are herbs such as creeping cinquefoil, ribwort plantain and lesser hawkbit.