This is the floodplain formed after the heavy rain previously!
The formation of a Floodplain:
According to my friend - cherrylet , she says that Floodplains are usually at the lower course of the river. It is made by a meander eroding sideways as it travels downstream. When a river breaks its banks and floods, it leaves behind layers of rock and mud, thus gradually building up to nearby flat valley floor. Floodplains contain sediments, often extending below the bed of the stream. The sendiments include sand, gravel, loam, silt and clay.
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