South Thames Estuary and Marshes are nationally scarce plants on dykes, and the diverse invertebra include nationally rare beetles, flies and true bugs. 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
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