Why are meanders formed in the middle course?

Meanders are formed in the middle course of a river due to the interplay of erosion and deposition. As the river flows, it encounters varying sediment types and bank materials, leading to changes in water speed and direction. The faster-moving water erodes the outer bank, creating a river bend, while slower water on the inner bank allows sediment to deposit, gradually accentuating the meander. This process continues over time, resulting in the characteristic winding shape of the river.