Physiographic Divisions

Summary

Bangladesh's physiographic divisions are landform regions distinguished by origin, relief, sediment, drainage and surface materials.

Core concept

Understand the system

Bangladesh's physiographic divisions are landform regions distinguished by origin, relief, sediment, drainage and surface materials.

Why / how it happens

Causes and context

Bangladesh's physiographic divisions are landform regions distinguished by origin, relief, sediment, drainage and surface materials. The governing relationship is: River deposition, erosion, tectonic uplift and older terrace surfaces produce contrasting floodplains, terraces and hill regions.

Mechanism / process

River deposition, erosion, tectonic uplift and older terrace surfaces produce contrasting floodplains, terraces and hill regions.

Key facts

• The broad physiographic framework includes floodplains, terraces and hills.
• Madhupur and Barind are major Pleistocene terrace regions.
• Chittagong Hill Tracts and other eastern hill areas differ sharply from the deltaic floodplains.

Important terminology

• floodplain
• terrace
• Pleistocene
• alluvium
• hill tract

Named examples / case studies

• The Barind Tract is an older, relatively elevated terrace compared with active alluvial floodplains.

Causes / components

• Key components: floodplain, terrace, Pleistocene.
• River deposition, erosion, tectonic uplift and older terrace surfaces produce contrasting floodplains, terraces and hill regions.

Effects / significance

• Madhupur and Barind are major Pleistocene terrace regions.
• Chittagong Hill Tracts and other eastern hill areas differ sharply from the deltaic floodplains.
• Application: The Barind Tract is an older, relatively elevated terrace compared with active alluvial floodplains.

Geography connection

The Barind Tract is an older, relatively elevated terrace compared with active alluvial floodplains. This illustrates how physiographic divisions varies by location, scale or environmental context.

Bangladesh connection

Physiography controls soil, drainage, agriculture, settlement and hazard patterns across Bangladesh's regions.

BCS preliminary facts

• The broad physiographic framework includes floodplains, terraces and hills.
• Madhupur and Barind are major Pleistocene terrace regions.
• Chittagong Hill Tracts and other eastern hill areas differ sharply from the deltaic floodplains.

BCS written analysis

Build an analytical answer

• Bangladesh's physiographic divisions are landform regions distinguished by origin, relief, sediment, drainage and surface materials.
• River deposition, erosion, tectonic uplift and older terrace surfaces produce contrasting floodplains, terraces and hill regions. Use the barind tract is an older, relatively elevated terrace compared with active alluvial floodplains. as a named application in a comparative answer.

Common misconceptions

• A physiographic division is based on landform and process, not only administrative boundaries.
• Terraces are older surfaces, not simply any high riverbank.

Quick revision

• Physiographic Divisions
• The broad physiographic framework includes floodplains, terraces and hills.
• Madhupur and Barind are major Pleistocene terrace regions.
• floodplain / terrace
• Definition → process → spatial example