In terms of geology, a delta is usually defined as a landform that is formed when the rivers flow and ultimately get mixed up with the static water body such as ocean, seas, lake, and estuaries. It is a depositional landform, which is created as the sediments are deposited and these sediments are fine-grained in nature. Deltas are triangular in shape and the flow of the water here is significantly very slow. These deltas are generally considered to be the mouth of the river.
