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4 RIVERS STS086.ESC.0008115 Coppename River, Suriname River, Suriname STS086.ESC.00081321 Amazon River, Brazil STS076.ESC.07022920 Senegal (meandering river, abandoned arm, almost oxbow lakes) Meanders STS076.ESC.01080736 Amazon River, Brazil STS076.ESC.07191919 Pakistan STS076.ESC.06232512 Nile River On many floodplains, channels follow curves and bends called meanders. The channels cut through unconsolidated sediment and easily eroded bedrock. Meanders can migrate over periods of years, eroding the outside of beds where the current is strongest. Curved sandbars, called point bars, are deposited on the inside banks, where the current is slower. As the bends grow closer and closer together the river may bypass a loop and take a new shorter course, leaving behind an oxbow lake. [[image]] (a) Erosion at outside bend Deposition of point bar at inside bend [[image]] Position of strongest current shifts from side to side [[image]] (c) Silt and clay deposits in former channel connections Oxbow lake [[image]] Direction of meander migration A Sedimentation Maximum velocity B Erosion From Press and Siever, 1998, Understanding Earth, Second Edition.