A river delta is a landform created at the mouth of a river, where it meets a body of water like an ocean or a lake. As the river flows, it carries sediment that settles when the water slows down, forming a fertile area rich in nutrients.

Deltas can be classified based on their shape:

Triangular Delta: This is the most common shape, resembling a triangle, such as the Ganges-Brahmaputra delta.
Cuspate Delta: These have a pointed shape, formed when sediment is deposited evenly on both sides of the river, like the Nile Delta.
Bird’s Foot Delta: Characterized by protruding points resembling a bird’s foot, seen in the Mississippi Delta.
These shapes depend on the river’s flow, sediment load, and tidal influences, affecting their ecological and agricultural significance.