How did the Mahanadi River help form Odisha’s coastal plains?

The Mahanadi River has played a fundamental role in shaping Odisha’s coastal plains through its activity as a major silt-depositing stream. As one of the most active rivers in this regard on the Indian subcontinent, the Mahanadi transports vast quantities of alluvium—a mixture of silt, sand, clay, and gravel—downstream.12

Upon reaching the coast, the river’s velocity decreases, causing it to deposit this sediment and form an extensive delta in the central part of the state. These deltaic deposits, combined with marine sediments, constitute the primary composition of the coastal lowlands, locally known as the Utkal Plains. This process of deep sedimentation has created a fertile, level landscape that is significantly wider than the coastal plains found along India's western coast. The resulting alluvial soils are highly productive, supporting the region's agricultural economy.312456