Which one of the following groups of rivers have their sources near Lake Manasarovar?

1. Classification of Indian Drainage Systems (basic)

To understand India's vast network of rivers, we first look at how they are classified. The most fundamental way to group them is by their orientation to the sea—where they ultimately end their journey. Roughly 77 per cent of India's drainage area, including massive systems like the Ganga and Brahmaputra, flows into the Bay of Bengal. The remaining 23 per cent, comprising the Indus, Narmada, and Tapi, discharges into the Arabian Sea. These two drainage basins are separated by a natural water divide that runs along the Delhi ridge, the Aravallis, and the Sahyadris (Western Ghats) INDIA PHYSICAL ENVIRONMENT, Chapter 3: Drainage System, p.19.

However, for a deeper understanding of their behavior, geographers prefer classifying rivers based on their mode of origin, nature, and characteristics. This gives us two main categories: the Himalayan drainage and the Peninsular drainage. While this is the most accepted classification, it is not perfect—rivers like the Chambal, Betwa, and Son actually originate in the Peninsular highlands but are considered part of the Himalayan (Ganga) system because of where they flow INDIA PHYSICAL ENVIRONMENT, Chapter 3: Drainage System, p.19.

The differences between these two systems are striking and rooted in geological history:

Feature	Himalayan Rivers	Peninsular Rivers
Nature of Flow	Perennial (water year-round from snowmelt and rain)	Seasonal (dependent mostly on monsoon rainfall)
Geological Age	Young, active, and still deepening their valleys	Older, stable, and flow through largely-graded shallow valleys
Origin	Lofty Himalayan peaks and glaciers	Peninsular plateaus and small hills

As we see in CONTEMPORARY INDIA-I, Chapter 3: Drainage, p.17, the Himalayan rivers like the Indus and Brahmaputra are unique because they originate north of the main mountain ranges, cutting deep gorges through the mountains as they flow south. In contrast, the Peninsular rivers are much more mature, having reached a stage where they have eroded their paths into broad, shallow valleys over millions of years INDIA PHYSICAL ENVIRONMENT, Chapter 3: Drainage System, p.23.

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3: Drainage System, p.19; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3: Drainage System, p.23; CONTEMPORARY INDIA-I, Geography Class IX NCERT (Revised ed 2025), Chapter 3: Drainage, p.17

2. The Ganga River System: Glaciers and Confluences (intermediate)

The Ganga River System does not originate from a single, solitary stream. Instead, it is born from a series of high-altitude glacial streams in the Uttarakhand Himalayas that merge at specific sacred confluences known as the Panch Prayag (Five Confluences). The two primary headstreams are the Bhagirathi, which rises from the Gaumukh at the snout of the Gangotri Glacier, and the Alaknanda, which originates from the Satopanth Glacier above Badrinath Geography of India, Majid Husain, Chapter 3, p.12.

The Alaknanda is the "backbone" of these confluences. As it flows south toward the plains, it meets several tributaries at distinct points. Each meeting point is a 'Prayag'. Understanding these is crucial for mastering the geography of Northern India:

Confluence (Prayag)	Tributary merging with Alaknanda	Glacial Source of Tributary
Vishnu Prayag	Dhauli Ganga	Mana Glacier
Nand Prayag	Nandakini	Trishul Glacier
Karn Prayag	Pindari River	Pindari Glacier
Rudra Prayag	Mandakini (Kali Ganga)	Chorabari Glacier (near Kedarnath)
Dev Prayag	Bhagirathi	Gangotri Glacier (Gaumukh)

It is only after the Dev Prayag confluence that the combined stream is officially called the Ganga NCERT Class XI, India Physical Environment, Chapter 3, p.25. From here, the river cuts through the Shivalik ranges and finally debouch (emerges) into the northern plains at Haridwar, having traveled nearly 289 km through the rugged mountains Geography of India, Majid Husain, Chapter 3, p.12.

Sources: Geography of India ,Majid Husain, (McGrawHill 9th ed.), Chapter 3: The Drainage System of India, p.12; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3: Drainage System, p.25

3. Evolution of the Himalayan Rivers (intermediate)

To understand the Evolution of the Himalayan Rivers, we must look back millions of years to a time when the drainage map of India looked nothing like it does today. Geologists largely support the Indo-Brahma River Theory (also known as the Shiwalik River Theory). This theory suggests that during the Miocene period (about 5 to 24 million years ago), there wasn't a separate Indus, Ganga, and Brahmaputra. Instead, there was one single, massive river that traversed the entire longitudinal extent of the Himalayas from Assam in the east to Punjab in the west, eventually discharging into the Gulf of Sindh INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.20. The evidence for this lies in the Shiwalik hills, which are composed of alluvial deposits like sand, silt, and boulders that indicate a continuous river flow over a vast distance.

This "mighty river" did not last forever. It was eventually dismembered into the three distinct systems we see today due to major geological upheavals during the Pleistocene epoch. Two specific events changed the course of Indian geography forever:

• The Potwar Plateau Uplift: In the west, the uplift of the Potwar Plateau (including the Delhi Ridge) acted as a physical barrier. This created a water divide, forcing the Indus system to flow westward and the Ganga system to flow eastward Geography of India, Majid Husain, The Drainage System of India, p.7.
• The Malda Gap Down-thrusting: In the east, the area between the Rajmahal Hills and the Meghalaya Plateau subsided (sank), creating what we call the Malda Gap. This "hole" in the landscape acted like a drain, diverting the Ganga and Brahmaputra systems away from their westward path and sending them south toward the Bay of Bengal INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.20.

While the Indo-Brahma theory is the most widely accepted, some geologists propose the Multiple River Theory. They argue that a large longitudinal river was unlikely and instead point to the Eocene Sea (Tethys Sea), which once covered parts of Sindh and Punjab, suggesting that the rivers evolved as the sea receded and the mountains rose Geography of India, Majid Husain, The Drainage System of India, p.8.

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.20; Geography of India ,Majid Husain, (McGrawHill 9th ed.), The Drainage System of India, p.7; Geography of India ,Majid Husain, (McGrawHill 9th ed.), The Drainage System of India, p.8

4. Peninsular River Systems and Major Watersheds (intermediate)

While the Himalayan rivers are known for their youth and Himalayan scale, the Peninsular Drainage System represents a much older, more stable chapter of India's geological history. These rivers are characterized by their broad, shallow, and graded valleys, which indicate that they have reached a state of maturity. Unlike the perennial, glacier-fed Himalayan rivers, the Peninsular rivers are seasonal; their volume is entirely dependent on the monsoon rains. During the dry summer months, even major rivers like the Godavari or Krishna see a significant reduction in their water levels NCERT Class IX, Drainage, p.18.

The primary water divide in South India is the Western Ghats. This mountain range runs parallel to the western coast and acts as a topographical wall. Most of the major rivers—such as the Mahanadi, Godavari, Krishna, and Kaveri—originate near the Western Ghats and flow eastward, following the general tilt of the Peninsular plateau toward the Bay of Bengal NCERT Class XI, Drainage System, p.23. However, there are notable exceptions: the Narmada and Tapi. These rivers flow westward into the Arabian Sea because they occupy rift valleys formed by faulting, rather than following the plateau's natural slope NCERT Class IX, Drainage, p.21.

Feature	East-Flowing Rivers (e.g., Godavari)	West-Flowing Rivers (e.g., Narmada)
Mouth	Drain into the Bay of Bengal.	Drain into the Arabian Sea.
Landforms	Form large deltas at the coast.	Form estuaries (no delta).
Catchment	Large drainage basins.	Relatively smaller drainage basins.

An interesting sub-set of the Peninsular system includes rivers like the Chambal, Betwa, and Son. Though they originate in the northern part of the Peninsular plateau (Central Highlands), they flow northward to join the Yamuna and Ganga systems NCERT Class XI, Drainage System, p.23. This highlights that the plateau is not a single uniform slope but a complex arrangement of highlands and troughs, such as the Narmada-Son trough Majid Husain, Physiography, p.55.

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3: Drainage System, p.23; CONTEMPORARY INDIA-I, Geography, Class IX (Revised ed 2025), Chapter 3: Drainage, p.18, 21; Geography of India, Majid Husain (9th ed.), Chapter 2: Physiography, p.55

5. Water Diplomacy: The Indus Water Treaty (exam-level)

The Indus Waters Treaty (IWT), signed on September 19, 1960, stands as one of the most resilient examples of water diplomacy in the world. Following the 1947 Partition, the Indus basin—a complex network of rivers—was geographically split, leaving the headworks in India while the vast irrigation canals were in Pakistan. This created a 'riparian' conflict that was eventually resolved after nearly a decade of negotiations brokered by the International Bank for Reconstruction and Development (World Bank) Geography of India, Majid Husain, The Drainage System of India, p.39. The treaty was signed in Karachi by Indian Prime Minister Jawaharlal Nehru and Pakistani President Ayub Khan A Brief History of Modern India, Spectrum, Developments under Nehru’s Leadership, p.650.

The treaty established a unique framework for sharing the six main rivers of the Indus system by dividing them into two distinct groups based on their geography:

Category	Rivers	Primary Allocation
Eastern Rivers	Ravi, Beas, and Satluj	India has exclusive rights for unrestricted use.
Western Rivers	Indus, Jhelum, and Chenab	Pakistan receives the bulk of the water, subject to specific Indian rights.

A critical nuance often tested in exams is India's rights over the Western Rivers. While allocated to Pakistan, India is permitted to use these waters for 'non-consumptive' purposes. This includes domestic use, limited agricultural use, and the construction of run-of-the-river hydroelectric projects (which do not involve significant storage or diversion of water) Geography of India, Majid Husain, The Drainage System of India, p.39. To manage disputes and maintain technical cooperation, the treaty created the Permanent Indus Commission, which requires officials from both nations to meet regularly.

The IWT is remarkable for its survival; it has remained functional through multiple wars (1965, 1971, and 1999) and periods of high diplomatic tension Contemporary World Politics, NCERT Class XII, Contemporary South Asia, p.39. While modern debates often focus on environmental changes or strategic leverage, the treaty remains the bedrock of hydro-relations in the subcontinent.

Sources: Geography of India ,Majid Husain, (McGrawHill 9th ed.), The Drainage System of India, p.39; Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary South Asia, p.39; A Brief History of Modern India (2019 ed.). SPECTRUM., Developments under Nehru’s Leadership (1947-64), p.650

6. The Tibeto-Himalayan Hydrographic Hub (exam-level)

Welcome back! We are now at a crucial junction in our study of Himalayan geography. Imagine a high-altitude 'Grand Central Station' for water, situated nearly 5,000 meters above sea level on the Tibetan Plateau. This is the Tibeto-Himalayan Hydrographic Hub, centered around the sacred Mount Kailash and Lake Manasarovar. While many rivers drain the Himalayas, this specific region is unique because it acts as the cradle for three of Asia's most formidable river systems, sending them in diametrically opposite directions to carve their paths through the mountains.

The three 'siblings' of this hub are the Indus, the Satluj, and the Brahmaputra. Each originates within a small radius of one another, yet they embark on vastly different journeys:

• The Brahmaputra: Known as the Tsangpo ('The Purifier') in Tibet, it originates from the Chemayungdung glacier (as noted in INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3, p.22) or the Angsi glacier (Geography of India, Majid Husain, Chapter 3, p.17) located southeast of Lake Manasarovar. It flows eastward for nearly 1,200 km before turning south into India.
• The Indus: This mighty river finds its source in the Bokhar Chu glacier on the northern slopes of the Kailash range (Geography of India, Majid Husain, Chapter 3, p.18). Unlike the Brahmaputra, it flows north-westward through Ladakh.
• The Satluj: It takes birth from Lake Rakshastal, a salt-water lake located immediately west of and connected to Lake Manasarovar. It eventually enters India through the Shipki La pass.

It is a common pitfall to assume the Ganga or Yamuna also originate here. However, they are distinctively 'Indian' in their origin, rising from the Gangotri and Yamunotri glaciers in Uttarakhand, hundreds of kilometers to the south and east of this Tibetan hub. Understanding this distinction is key to mastering the drainage map of South Asia.

River	Specific Source	Initial Direction
Indus	Bokhar Chu / Kailash North	North-West
Satluj	Lake Rakshastal	West
Brahmaputra	Angsi / Chemayungdung	East

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 3: Drainage System, p.22; Geography of India, Majid Husain (McGrawHill 9th ed.), Chapter 3: The Drainage System of India, p.17-18

7. Solving the Original PYQ (exam-level)

You have just mastered the building blocks of the Indian Drainage System, specifically the distinction between Trans-Himalayan and Himalayan rivers. This question brings those concepts to life by asking you to identify the Kailash-Manasarovar region as a massive hydrographic hub in Tibet. As you learned in INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), this high-altitude plateau acts as a starting point for rivers that eventually flow into different seas—the Arabian Sea and the Bay of Bengal—after traversing thousands of kilometers across the subcontinent.

To arrive at the correct answer, visualize the map of the Tibetan Plateau. The Indus originates from the northern slopes of the Kailash range, while the Brahmaputra (known as the Tsangpo in Tibet) emerges from the Chemayungdung or Angsi glaciers near Lake Manasarovar. The Satluj rounds out this group, originating from Lake Rakshastal, which is physically connected to Manasarovar. By connecting these specific local origins to the broader Trans-Himalayan category, the logic points directly to (C) Brahmaputra, Satluj, Indus as the only set where all three rivers share this specific proximity.

The common trap UPSC sets here is the inclusion of the Ganga and Yamuna in the other options. While they are iconic Himalayan rivers, your studies in Geography of India, Majid Husain clarify that they originate hundreds of kilometers away in the Uttarakhand Himalayas at the Gangotri and Yamunotri glaciers, respectively. In the Prelims, the elimination technique is your best friend: as soon as you see "Ganga" in options (A), (B), and (D), you can strike them out, as the Ganga does not share the Trans-Himalayan source of the Manasarovar group.