Alluvial soil is mainly found in which of the following regions?

The correct answer is 'Indus-Ganga-Brahmaputra plains' Key Points Alluvial Soil: Alluvial soil is one of the most fertile and widespread soils in India, mainly formed by the deposition of silt, sand, and clay brought down by rivers. It is primarily found in river basins and plains, making it ideal for agriculture due to its high fertility and rich nutrients such as potash, phosphoric acid, and lime. The Indus-Ganga-Brahmaputra plains are the largest alluvial soil region in India, covering states like Punjab, Uttar Pradesh, Bihar, West Bengal, and Assam. These plains are formed by the deposition of sediments brought by the rivers Indus, Ganga, and Brahmaputra over thousands of years. Crops such as rice, wheat, sugarcane, and jute are extensively cultivated here due to the soil’s fertility. Additional Information Hills of Assam: The hills of Assam do not have significant deposits of alluvial soil. Instead, they predominantly consist of laterite soil, which forms due to intense leaching in areas of high rainfall. Laterite soil is less fertile compared to alluvial soil and is more suitable for crops like tea and cashew nuts. Alluvial soils are found in the plains of Assam, particularly along the Brahmaputra river, but not in the hilly areas. Mid-latitude zone of Himalaya: The mid-latitude zone of the Himalayas primarily consists of forest soils and mountainous soils, which are less fertile and unsuitable for extensive agriculture. These soils are formed by weathering of rocks and are often shallow and stony, unlike the deep and fertile alluvial soils of plains. While rivers originating from the Himalayas contribute to the formation of alluvial soil, the soil itself is not found in the mid-latitude zone of the mountains. Western Tamil Nadu: Western Tamil Nadu is predominantly characterized by red soil and black soil rather than alluvial soil. Red soil forms due to the weathering of crystalline rocks and is relatively less fertile compared to alluvial soil. Black soil, which is highly suitable for cotton cultivation, is also widespread in Tamil Nadu but is not alluvial soil. Alluvial soil in Tamil Nadu is primarily found along river valleys like the Cauvery delta region, not in the western part of the state.