BharatNotes What is Bhabar and Terai?
The Northern Plains of India are conventionally divided, on the basis of relief, into four parallel belts running broadly west to east: Bhabar, Terai, Bhangar and Khadar (NCERT Class 9, Physical Features of India). Bhabar and Terai are the two northernmost belts, hugging the foot of the Shiwaliks (the outer Himalayas).
The Bhabar is a narrow strip, roughly 8–16 km wide, where rivers emerging from the mountains lose velocity and deposit pebbles, boulders and coarse debris, building a belt of coalesced alluvial fans. The Terai lies immediately to its south as an ill-drained, damp, marshy and once densely forested tract running parallel to the Bhabar.
Key Features
The defining contrast between the two belts is hydrological. In the porous, pebble-studded Bhabar, surface streams sink and flow underground, so river courses stay dry except in the rainy season. These subsurface streams re-emerge in the Terai, saturating the land and creating swamps, marshes and tall grasslands.
| Feature | Bhabar | Terai |
|---|---|---|
| Position | Foot of Shiwaliks (northernmost) | South of Bhabar |
| Width | About 8–16 km | About 15–30 km |
| Material | Coarse pebbles, boulders, gravel | Finer sediments, water-logged soils |
| Drainage | Highly porous; streams go underground | Streams re-surface; marshy, ill-drained |
| Water table | Deep | At/near the surface |
| Vegetation/land use | Poor for crops; large-rooted trees | Forests, grasslands; reclaimed for sugarcane, rice, wheat |
Significance and Current Status
The Terai belt has historically been malaria-prone and forested, but large parts in Punjab, Uttar Pradesh and Uttarakhand have been cleared and reclaimed for intensive agriculture, yielding sugarcane, rice and wheat. The surviving forests and grasslands are ecologically vital. They form part of the Terai Arc Landscape (TAL), an ~810 km conservation stretch between the Yamuna in the west and the Bhagmati in the east, spanning India and Nepal and comprising the Shiwalik hills, the Bhabar and the Terai flood plains (WWF India).
The TAL hosts flagship protected areas including Jim Corbett (established 1936 in Uttarakhand, independent India's first national park, named after Jim Corbett), Dudhwa Tiger Reserve (Lakhimpur Kheri, Uttar Pradesh) and Rajaji National Park, and is critical habitat for the tiger, Indian rhinoceros and Asian elephant.
UPSC Angle
A common trap is conflating the two pairs: Bhabar–Terai are distinguished by relief and drainage, whereas Bhangar–Khadar are distinguished by the age of alluvium (old vs new). Remember the cause-effect chain — Bhabar porosity makes streams disappear, Terai is where they reappear and create marshes. For GS3, link the Terai to grassland and tiger conservation via the Terai Arc Landscape. This is a foundational concept that recurs across questions on Indian physiography, drainage and alluvial soils.
