Largest Alluvial Plain of the World

The Great Plain of North India also known as Indo-Gangetic-Brahmaputra Plain is the largest alluvial plain of the world. This arcuate plain extends for a length of 3200 km from the mouth of the Indus to the mouth of the Ganga. The plain lies partly in Pakistan and partly in India. The length of the plain in India is around 2400 km. The average width of the plain varies from 150 to 300 km. It is widest in the west where it stretches for about 500 km. Its width decreases in the east. It is about 280 km wide near Allahabad and 160 km near Rajmahal Hills. The plain widens to about 460 km in Bengal but narrows down in Assam where it is only 60-100 km wide. The plain covers a total area of 7.8 lakh sq km. The northern boundary of the plain is well defined by the foothills of the Shiwaliks but its southern boundary is a wavy irregular line along the northern edge of the Peninsular India.