The Wash Estuary is a large, shallow estuary located on the east coast of England. It is formed where the rivers Great Ouse, Witham, Nene, and Welland meet the North Sea. The estuary is known for its rich biodiversity, providing a habitat for various species of birds, fish, and other wildlife. The Wash is also an important area for agriculture and fishing. Its mudflats and salt marshes support both commercial and recreational activities. Additionally, the estuary is designated as a Special Protection Area (SPA) and a Site of Special Scientific Interest (SSSI) to help conserve its unique environment.