Which of the following best defines Duars ........

Geography Geomorphology

Which of the following best defines Duars?

The tract of land lying between two converging or confluent rivers.

The alluvial floodplains in northeastern India that lies south of the outer foothills of the Himalayas and north of the Brahmaputra River basin.

The land drained by the brackish water.

The landscape all along the foothills of Shiwaliks.

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Explanation:

The Dooars or Duars are the alluvial floodplains in northeastern India that lie south of the outer foothills of the Himalayas and north of the Brahmaputra River basin. This region is about 30 km (19 mi) wide and stretches over about 350 km (220 mi) from the Teesta River in West Bengal to the Dhanshiri River in Assam. The region forms the gateway to Bhutan. It is part of the Terai-Duar savanna and grasslands ecoregion.
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The Terai-Duar savanna and grasslands is a narrow lowland ecoregion at the base of the Himalayas, about 25 km (16 mi) wide, and a continuation of the Gangetic Plain. It is colloquially called Terai in the Ganges Basin east to Nepal, then Dooars in West Bengal, Bangladesh, Bhutan and Assam east to the Brahmaputra River. The world's tallest grasslands are found in this ecoregion, which are the most threatened and rare worldwide.