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
Wouri estuary are divided by the Dibamba River and by Monaka Bay and Island. About of the mangrove forest is within the Mouanko Reserve, which extends from the south shore of the estuary to the Sanaga River mouth. The mangrove "Rhizophora racemosa", which makes up over 90% of mangroves in Cameroon, reaches a height of in the Wouri estuary. "Nypa fruticans", an exotic species imported to Nigeria from South-East Asia, has been spreading quickly, encouraged by the local people. The mangrove forests are an important source of wood for making furniture and fences, for smoking fish and for fuel. The leaves of