The middle course of a river normally shows

The middle course of a river normally shows meanders. Meanders are bends or loops in a river's channel that are characterized by the erosion of the outer banks and deposition of sediment on the inner banks. The middle course of a river is where the gradient of the river is less steep and the water flow is slower, so the river has less energy to transport sediment. As a result, the river meanders and forms curves and loops in its course.