Canvey Island risks to London and the Thames estuary area. It is proposed that the western side of Canvey is developed as a site which is either temporarily flooded at times of risk, or transformed into a permanent wetland. Developments in the 20th century have produced a marked contrast between the environments in the east and west of the island. The eastern half of the island is allocated to residential areas, the main public amenities and a small holiday camp and seafront, while the western half of the island is mainly farmland, marshes and industrial areas. The marshes in the west include
Grand Codroy Estuary estuary since 1974. The estuary consists of adjoining marine and intertidal habitats with an elevation no more than one metre. Four islands are located within the estuary, and the intertidal sandbars give way to mudflats "supporting rich growths of Zostera". The site is surrounded by cultivated grasslands. The marine area is shallow, at most two metres deep in intertidal areas, and somewhat deeper in the river channel. It is bounded by privately owned land, the Codroy Valley Provincial Park, and the Gulf of Saint Lawrence. Nearby are the Grand Codroy and Little Codroy rivers, which are popular fishing destinations. The