A Doab—derived from the Persian words do (two) and ab (water)—signifies the alluvial tract of land lying between two confluent or parallel rivers. Within the Northern Plains and the North-Western landform units of India, doabs serve as the primary geomorphic building blocks. These landforms are characterized by distinct depositional strata, transitioning from low-lying floodplains (Khadar) to elevated, older alluvial terraces (Bhangar). The systematic configuration of these doabs dictates the agricultural zone patterns, historical trade routes, and settlement geography of the Indus and Ganga river basins.
The Punjab Doabs (Indus River System)
The North-Western landform unit is structurally defined by the Five Rivers of the Punjab plains. These rivers create a series of five distinct doabs between the Indus River in the west and the Satluj River in the east. The regional slope of these doabs runs from the north-east to the south-west, conforming to the structural lineaments of the Himalayan foredeep.
| Doab Name | Confluent/Bounding Rivers | Key Geomorphic & Regional Features |
| Sind Sagar Doab | Indus River and Jhelum River (extending to Chenab) | Located in the westernmost tier; encompasses the rugged Potohar Plateau and the hyper-arid Thal Desert tract. |
| Jech Doab | Jhelum River and Chenab River | Also historically spelled as Chaj Doab; characterized by extensive salt-range topographies at its northern apex and highly intensive canal irrigation networks. |
| Rechna Doab | Chenab River and Ravi River | Spans a highly fertile plain; exhibits structural features like Dhaya (abrupt bluffs separating the upland plain from floodplains). |
| Bari Doab | Ravi River and Beas River | Contains the high-elevation Majha region, which forms the cultural and historical core of the Punjab plains. |
| Bist Doab | Beas River and Satluj River | Also known as the Jalandhar Doab; characterized by a highly stable water table, minimal waterlogging, and extreme agricultural productivity. |
Structural Micro-Features of Punjab Doabs
Dhaya Topography
The older alluvium (Bhangar) fields within the Punjab doabs terminate abruptly in cliff-like river banks or bluffs known as Dhaya. These escarpments rise anywhere from 3 to 12 meters above the low-lying modern floodplains, acting as natural barriers against seasonal inundation.
Bet Lands
The active, younger alluvial floodplains situated at the base of the Dhaya are locally termed Bet lands. These areas are subjected to annual nutrient replenishment through silting, making them highly productive for rabi cultivation despite the recurring hazard of channel shifting.
The Chos of Hoshiarpur
The northern margins of the Bist Doab, adjacent to the Shiwalik hills, are heavily dissected by seasonal, ephemeral mountain torrents called Chos. These torrents cause severe gully erosion, stripping the topsoil and depositing infertile coarse sand over agricultural tracts.
The Ganga-Yamuna Doab System
The transition into the Northern Plains proper is marked by the Ganga-Yamuna Doab, an asymmetrical structural trough running parallel to the Himalayan arc. This macro-doab is divided into three distinct segments based on aridity, elevation, and sediment morphology.
Upper Ganga-Yamuna Doab
This region extends from the Shiwalik foothills down to the Aligarh terrain. It features a high water table and is marked by Bhur formations, which are localized, wind-blown sand accumulations forming low ridges along the elevated banks of the Yamuna River.
Middle Ganga-Yamuna Doab
Spanning from Aligarh to Allahabad (Prayagraj), this segment marks the true confluence zone. It is dominated by a expansive Bhangar terrace that is heavily modified by ancient paleochannels and alkaline soil patches known as Reh or Kallar.
Lower Doab Tracts
South-east of the primary confluence at Prayagraj, the interfluves thin down into localized doabs, such as those between the Ganga and Ghaghara rivers, and the Ghaghara and Gandak rivers. These regions are low-lying, prone to structural waterlogging, and feature numerous oxbow lakes locally called Tals or Chaurs.
Regional Doabs of the Semi-Arid North-West and Desert
While the Thar Desert (Marusthali) is predominantly an area of internal drainage, its eastern and northern fringes interact directly with the Indus and ancient Vedic river networks, creating relict or paleofloodplain doabs.
The Indo-Ghaggar Doab
Situated across the political boundaries of Haryana, Punjab, and northern Rajasthan, this region represents the interfluve between the Satluj River and the seasonal Ghaggar-Hakra River system (the identified paleochannel of the lost Saraswati River). The subsurface stratigraphy retains vast sweet-water aquifers embedded in older alluvium, driving deep-well agricultural expansion in the Sri Ganganagar and Hanumangarh districts.
The Luni-Aravalli Interfluve
Known structurally as the Rajasthan Bagar, this semi-arid steppe tract forms the transitional zone between the Aravalli Range and the hyper-arid sand dunes of Marusthali. It is drained by short, seasonal streams that form localized fertile tracts termed Rohi.
Prelims-Centric Fact File and Geographical Trivia
Khadir vs. Bhangar Elevation Rule
In all North Indian doabs, the Bhangar represents the older Pleistocene alluvium forming the upland terraces, whereas the Khadar represents the Holocene newer alluvium confined to the active river channels.
The Malwa Plain of Punjab
This geographical region should not be confused with the Malwa Plateau of Madhya Pradesh. The Malwa Plain refers explicitly to the highly developed, canal-irrigated southern portion of the Bari and Bist doabs in Punjab.
Nadi Chars and Diara Lands
Within the mature braided channels of rivers forming the boundaries of the middle and lower doabs, active sandbar islands arise during the lean season. These dynamic, fertile island-enclaves are designated as Diara lands in Bihar and Chars in West Bengal.
The Indus Kohistan
The extreme north-western corner of the Sind Sagar Doab touches the rugged, un-demarcated mountainous tract of Indus Kohistan, demonstrating where alpine topography directly feeds into plain-level alluvial deposition.
Last Modified: June 4, 2026