Agriculture has always been the foundation of the Indian economy, and its regional distribution has been profoundly influenced by geographical conditions. India's vast physical diversity, comprising the Himalayan mountains, Indo-Gangetic plains, plateau regions, deserts, coastal belts, and river valleys, created distinct agricultural zones with different cropping patterns, farming techniques, and settlement structures. Climate, rainfall, soil, river systems, topography, and vegetation collectively determined the agricultural map of India from ancient times through the medieval period. However, while geography was the primary determinant, technological innovations, irrigation systems, state policies, social institutions, and market forces also played significant roles in modifying regional agricultural patterns. The availability of fertile soil was perhaps the most significant geographical factor shaping agriculture. The alluvial plains of the Indus, Ganga, and Brahmaputra rivers became the most productive agricultural regions due to their deep, fertile, and annually replenished soils. These plains supported intensive cultivation of cereals such as wheat, rice, barley, and pulses. The abundance of fertile land encouraged dense population, permanent settlements, and the emergence of complex agrarian societies. Ancient kingdoms and medieval empires alike depended heavily upon the agricultural surplus generated by these fertile river valleys. Rainfall patterns greatly influenced crop selection and agricultural productivity. India experiences highly uneven rainfall due to the southwest and northeast monsoons. Regions receiving abundant rainfall, such as Bengal, Assam, Odisha, Kerala, and the coastal areas, naturally specialized in rice cultivation. Rice requires substantial water, and the humid climate of eastern and southern India was ideal for its growth. In contrast, the northwestern regions of Punjab, Rajasthan, and western Uttar Pradesh, with comparatively lower rainfall, emphasized wheat, barley, gram, and millets. Semi-arid regions also became centres for drought-resistant crops such as bajra and jowar. The river systems significantly shaped the agricultural landscape. Perennial rivers like the Ganga, Yamuna, Brahmaputra, Indus, Godavari, Krishna, Kaveri, and Narmada provided water for irrigation and enriched adjoining lands with fertile silt. River valleys became centres of intensive cultivation because irrigation reduced dependence on uncertain rainfall. The fertile deltaic regions of the Godavari, Krishna, and Kaveri supported highly productive rice agriculture and became prosperous agrarian centres under various South Indian dynasties such as the Cholas. River-based agriculture also encouraged urbanization, trade, and state formation due to the generation of substantial agricultural surplus. The diversity of soils created distinct regional agricultural patterns. The black cotton soils of the Deccan plateau, formed from volcanic lava, possessed excellent moisture-retaining capacity. These soils became particularly suitable for cotton cultivation and also supported sorghum, pulses, and oilseeds. Cotton cultivation in the Deccan later contributed significantly to India's flourishing textile industry. The red soils of Tamil