A plain is an extensive, flat, or gently rolling area of land that has relatively low elevation compared to surrounding terrains. Plains are formed through various geological processes, primarily denudation, which involves the wearing away of the Earth’s surface through erosion and weathering.

Classification of Plains Formed Through Denudational Process:

Erosional Plains:

These plains result from the erosion of elevated landforms, leading to a flat terrain. They are often found in regions where water, wind, or glacial action has worn down the surface. Example: The Great Plains of North America.
Depositional Plains:

Formed by the accumulation of sediments deposited by rivers, glaciers, or wind. These plains are typically fertile and support agriculture. Example: The alluvial plains of the Ganges and the Indus rivers in India.
Lowland Plains:

These are found at lower elevations and can be formed through a combination of erosion and sedimentation. They often include swamps and marshes. Example: The Coastal Plains of the southeastern United States.
Drift Plains:

Created by the deposition of glacial materials, these plains are characterized by undulating surfaces and are often rich in minerals. Example: The Drift Plains of the northern United States.
Understanding these plains is essential for studying ecosystems, agriculture, and land use planning, as they significantly influence human activity and development.