Correct Option
The correct option is Shiwalik foothills.
Explanation
The Bhabar belt is a distinct physiographic region located at the junction of the Himalayan mountains and the Great Plains of India. It is characterized by the deposition of coarse alluvial material such as pebbles, rocks, and boulders brought down by rivers descending from the mountains.
Detailed Analysis
- Location relative to ranges: The Bhabar belt stretches in a narrow strip, approximately 8 to 16 km wide, running in an east-west direction. It lies immediately south of and strictly parallel to the Shiwalik foothills (the Outer Himalayas).
- Formation Process: As rivers flow down from the steep slopes of the Himalayas, the sudden decrease in slope at the foothills causes them to deposit their load of heavy sediments. This results in a porous, pebble-ridden zone.
- Hydrological Characteristic: Due to the high porosity of the rock debris, small streams and rivers often disappear underground in the Bhabar belt, only to re-emerge in the swampy and marshy Terai belt located to its south.
- Incorrect Options: The Greater Himalayas and Middle Himalayas are located further north, and the Karakoram Range is part of the Trans-Himalayas. The Bhabar is specifically associated with the break in slope at the foot of the outermost range, the Shiwaliks.
Key Takeaway: The Bhabar belt is the northernmost section of the Northern Plains, consisting of porous, boulder-rich deposits lying parallel to the foot of the Shiwaliks.