The fertile land lying between two rivers that merge is known as a:

A doab is the stretch of land lying between two converging, or confluent, rivers. The word comes from Persian: "do" (two) and "ab" (water or river).

Features of doabs:

• Doabs are formed by the alluvial deposits of the two rivers, so they are generally very fertile.
• They are well suited for agriculture and are often densely populated.

The Ganga-Yamuna Doab:

• The most famous doab in India is the Ganga-Yamuna Doab, the land between the Ganga and the Yamuna in western Uttar Pradesh.
• It is one of the most fertile and productive agricultural regions of India, growing wheat, sugarcane, rice and other crops.
• It was the heartland of many ancient and medieval kingdoms.

Doabs of the Punjab:

The Punjab region is divided into doabs by its five rivers. Their names combine the first letters of the two rivers:

Bist Doab (Jalandhar Doab): between the Beas and the Sutlej.

Bari Doab: between the Beas and the Ravi; Amritsar and Lahore lie here.

Rechna Doab: between the Ravi and the Chenab.

Chaj Doab: between the Chenab and the Jhelum.

Sind Sagar Doab: between the Jhelum (and Chenab) and the Indus.

The names were given during the reign of Akbar, by his minister Raja Todar Mal, according to one tradition.

Raichur Doab:

• In the Deccan, the Raichur Doab lies between the Krishna and its tributary, the Tungabhadra.
• It was the scene of long wars between the Vijayanagara Empire and the Bahmani Sultanate in the 14th to 16th centuries.

Historical importance:

Because of their fertility and wealth, doabs were often fought over by rival kingdoms.

Why not the other options?

• ✗Duar (Dooars) is the foothill plain of north Bengal and Assam below the Bhutan hills.
• ✗A delta is land built at a river's mouth.
• ✗Terai is the marshy, forested belt along the foot of the Himalayas.