The River Bend is a small region in western central Illinois and southern Illinois that comprises parts of Madison County and Jersey County. The name comes from a section of the Mississippi River that flows roughly west to east instead of the usual north to south, causing a bend in the river. The area is within the Metro East region, which is within the Gr…The River Bend is a small region in western central Illinois and southern Illinois that comprises parts of Madison County and Jersey County. The name comes from a section of the Mississippi River that flows roughly west to east instead of the usual north to south, causing a bend in the river. The area is within the Metro East region, which is within the Greater St. Louis Metropolitan area.