Big Muddy River Southern Illinois with "loess", fine grained, wind born deposits. At the edge of the floodplain, dunes, called "loess hills", formed. The Pine Hills are loess hills standing several hundred feet above the floodplain. Prior to the construction of Rend Lake, much of the ancient lake bed was swamp: a forested area that was covered by water through most of the winter, and during wet summers. When the Big Muddy flooded, the water covered the flat bottom of the ancient lake bed for miles either direction from the meandering channel. The upper reaches of the Big Muddy are near Dix, Illinois.
Egypt River Egypt River The Egypt River is a stream in Ipswich, Massachusetts, United States. The river is formed by the confluence of Bull and Dow brooks below their reservoirs, and in turn joins the Muddy River and then the Rowley River, which empties into the Plum Island Sound. The Rowley River runs through salt marshes, in which it forms a narrow and winding inlet about in total length. The name "Egypt River" is recorded as early as 1635. In early colonial times, it was also termed the "North River". It was then a source of herring and smelt, but few have