Isle of Sheppey Yantlet Creek at the Isle of Grain to the west, it was occasionally used in ancient times by shipping to and from ports such as Chatham and London to reduce exposure to bad weather in the Thames Estuary or North Sea. The Kingsferry Bridge was first built in 1860, thus eliminating the need for ferries. Over time, there have been four bridges built over the Swale at this point. All bridges had to allow sufficient clearance for shipping heading to the commercial docks at Ridham: On 5 September 2013, fog caused a 130 vehicle pile-up on the Sheppey Crossing bridge
Tamar–Tavy Estuary Seaweeds, green algae and communities of polychaete worms are all found in the estuary system; near Calstock is found the shrimp "Palaemon longirostris", which has been recorded in only two other estuaries in Britain. The estuary is also one of only two sites in the UK where the fish, allis shad, spawn. Other larger animals found in undisturbed parts of the SSSI include the European otter, the common kingfisher and dormice. Tamar–Tavy Estuary The Tamar–Tavy Estuary is a Site of Special Scientific Interest (SSSI) covering the tidal estuaries of the River Tamar and the River Tavy on the border between