Rivers and their Tributaries

1. Introduction

The Indian drainage system comprises numerous large and small rivers. Its character is shaped by:

• Evolution of three major physiographic units (Himalayas, Indo-Gangetic plains, Peninsular plateau).
• Nature and distribution of precipitation (monsoon-dominated).

India has an extensive network of rivers (major + minor) and their tributaries. Understanding major rivers, their tributaries, and the contrasting characteristics of Himalayan vs Peninsular rivers is important for geography (physical & economic) in UPSC CSE.

2. Major Rivers and Their Tributaries

Key Points to Note:

• Indus system: Westernmost major system; five major tributaries (Panjnad rivers) join before entering Pakistan.
• Ganga system: Largest in terms of basin area and cultural-economic significance; Yamuna is its most important right-bank tributary.
• Brahmaputra system: Originates in Tibet (as Tsangpo); joins Ganga to form the world’s largest delta (Sundarbans).
• Peninsular rivers: Mostly east-flowing (Godavari, Krishna, Mahanadi, Kaveri) draining into Bay of Bengal; Narmada is a major west-flowing exception (into Arabian Sea).

3. Comparison: Himalayan Rivers vs Peninsular Rivers

Additional Insights for UPSC:

• Himalayan rivers are antecedent (pre-date the uplift of Himalayas in many cases) and continue to cut deep gorges.
• Peninsular rivers are largely consequent or superimposed and have reached a mature stage of development.
• Himalayan rivers cause more flooding and sediment load issues; Peninsular rivers are more stable but highly monsoon-dependent, leading to seasonal water scarcity.