South Thames Estuary and Marshes South Thames Estuary and Marshes South Thames Estuary and Marshes is a biological Site of Special Scientific Interest which stretches between Gravesend and the mouth of the River Medway in Kent. Part of it is a Nature Conservation Review site, Grade I, and part is a Royal Society for the Protection of Birds nature reserve. It is part of the Thames Estuary and Marshes Ramsar internationally important wetland site and Special Protection Area under the European Union Directive on the Conservation of Wild Birds. Over 20,000 waterfowl use this site, and some species are present in internationally important numbers. There
Dyfi Estuary Mudflats Dyfi Estuary Mudflats Dyfi Estuary Mudflats are mudflats on the estuary of the River Dyfi in Ceredigion, Wales, and are part of the Dyfi National Nature Reserve. The Dyfi Estuary is located on the conjunction of the counties of Ceredigion, Gwynedd and Powys. The area is designated a Special Protection Area (SPA), a protected site for wild birds under the EC Birds Directive. The area comprises the estuary and adjoining salt marsh and includes sandbanks, mudflats, peat bogs, river channels, meanders and creeks, with an extensive sand dune complex across the mouth of the estuary at Ynyslas. A large part