The Wash
The Wash looks on the map like a large bite out of the coastline of eastern England.  It separates the curved coast of East Anglia from Lincolnshire. It is formed by a large bay with three roughly straight sides meeting at right angles, each about 25 kilometres (15 miles) in length. All the eastern coast of the Wash is in Norfolk, and goes from Hunstanton in the north to the mouth of the River Great Ouse at King's Lynn in the south. The coast on the opposite side goes from Gibraltar Point to the mouth of the River Welland and is all in Lincolnshire. The southern coast goes roughly northwest-southeast, joining these two river mouths.  In the middle is the mouth of a third river, the River Nene.