Wash River
At the end of the latest glaciation, and while the sea level remained lower than it is today, the rivers Witham, Welland, Glen, Nene and Great Ouse joined into a large river.
The deep valley of the Wash was formed, not by the interglacial river, but by ice of the Wolstonian and Devensian stages flowing southwards up the slope represented by the modern coast and forming tunnel valleys of which the Silver Pit is one of many. It was this process which gave the Silver Pit its depth and narrowness. When the tunnel valley was free of ice and seawater, it was occupied by the river. This kept it free of sediment, unlike most of the tunnel valleys. Since the sea flooded it, the valley seems to have been kept open by tidal action. During the Ipswichian Stage, though the Wash River probably flowed by way of the site of the Silver Pit, the tunnel valley will not have been formed at this stage as its alignment seems inconsistent.
The Wash The Wash (England)Read more about this topic: The Wash
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—Henry David Thoreau (1817–1862)