The Indo-Gangetic Plain (Northern Plains)

Nearly a billion people live on one stretch of flat land. The Indo-Gangetic Plain, built entirely from river silt, is one of the most crowded landscapes on Earth.

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Indian Geography · IndGeo0027

The Indo-Gangetic Plain: Four Alluvial Belts

Bhabar

Narrow, porous gravel strip along the Shiwalik foothills. Rivers vanish underground here.

Tarai

Just south of Bhabar. Underground rivers re-emerge, feeding marshy, dense vegetation.

Bhangar

Older, higher alluvium set back from the river, with kankar (calcium-carbonate) nodules.

Khadar

Younger, active floodplain. Floods almost yearly, laying down fresh fertile silt.

~700,000 km²

Total extent of the plain

3 river systems

Indus, Ganga, Brahmaputra

~1 billion

People living on the plain

Why so crowded

Flat land, deep fertile soil, and year-round river water make this the easiest large stretch of land in India to farm — which is exactly why it also became the most densely populated.

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Must Know

• The Indo-Gangetic Plain is a vast lowland built by the Indus, Ganga, and Brahmaputra river systems.
• It lies between the Himalaya in the north and the Peninsular Plateau in the south.
• The plain spans roughly 700,000 square kilometres across India, Pakistan, Nepal, and Bangladesh.
• Within India, it covers Punjab, Haryana, Delhi, Uttar Pradesh, Bihar, West Bengal, and Assam.
• The plain formed entirely from alluvium — silt, sand, and clay carried down and deposited by these rivers.

Good to Know

• Geographers split the plain into four belts, based on the age and texture of the alluvium.
• Bhabar is a narrow, porous, gravel-and-pebble strip running along the Shiwalik foothills. Rivers vanish underground here.
• Tarai lies just south of Bhabar. The underground rivers re-emerge here, feeding marshy, densely vegetated land.
• Bhangar is the older, higher alluvium, set back from the rivers’ active floodplains. It contains calcium-carbonate nodules called kankar.
• Khadar is the younger, lower alluvium on the active floodplain. It floods almost every year, laying down fresh, fertile silt.

Test Yourself

Please wait…

1. Which three river systems built the Indo-Gangetic Plain through alluvial deposition?

The Indus, the Ganga, and the Brahmaputra

The Godavari, the Krishna, and the Kaveri

The Narmada, the Tapi, and the Mahanadi

The Sutlej, the Chenab, and the Jhelum

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Great to Know

• The plain is home to close to a billion people, roughly one-seventh of the world’s population.
• Average population density often exceeds 1,000 people per square kilometre — among the highest of any large region on Earth.
• That density traces back to the plain’s own geology: flat land, deep fertile soil, and year-round river water make it exceptionally easy to farm.
• Khadar’s annual flooding is a double-edged trait. It renews soil fertility for free, but also brings recurring flood risk to the same farmland.