Match List I with List II and select the correc answer using the code given below the Lists

(River) | (Source)
A.Ganga | 1. Amarkantak
B.Son | 2. Gaumukh
C.Godavari | 3. Mahabaleshwar
D.Krishna | 4. Trimbakeshwar
| 5.Mansarovar

1. Classification of Indian Drainage Systems (basic)

To understand how water flows across the Indian subcontinent, we look at the drainage system, which is essentially the network of rivers and their tributaries. India’s drainage is primarily classified based on two factors: origin (where the water comes from) and alignment (where the water ends up). The broad relief features of the subcontinent divide Indian rivers into two major groups: the Himalayan rivers and the Peninsular rivers CONTEMPORARY INDIA-I, Drainage, p.17.

The Himalayan rivers, such as the Indus, Ganga, and Brahmaputra, are perennial, meaning they flow year-round because they are fed by both rainfall and melting snow from the high mountains. Geologically, these are often antecedent rivers; they existed before the Himalayas were fully formed and continued to cut through the rising mountains, creating deep gorges Physical Geography by PMF IAS, Fluvial Landforms and Cycle of Erosion, p.211. In contrast, the Peninsular rivers are much older and reach a state of maturity with broad, shallow valleys. Most are seasonal, depending entirely on monsoon rainfall. A crucial feature here is the Western Ghats, which acts as a water divide; most major Peninsular rivers like the Godavari and Krishna flow eastwards into the Bay of Bengal, while smaller rivulets flow west to the Arabian Sea INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23.

Another fascinating way to classify these rivers is by their relationship to the underlying rock structure, known as discordant drainage. While most rivers follow the slope of the land, discordant rivers do not. This includes superimposed drainage, where a river maintains its original course even as it cuts through harder, older rock layers beneath it, a feature seen in some medium-scale rivers of the Northern Peninsular region Physical Geography by PMF IAS, Fluvial Landforms and Cycle of Erosion, p.213.

Feature	Himalayan Rivers	Peninsular Rivers
Nature of Flow	Perennial (Snow + Rain)	Seasonal (Rain only)
Geological Age	Young and active	Older and mature
Valleys	Deep V-shaped gorges	Broad and shallow

Sources: CONTEMPORARY INDIA-I, Drainage, p.17; INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23; Physical Geography by PMF IAS, Fluvial Landforms and Cycle of Erosion, p.211; Physical Geography by PMF IAS, Fluvial Landforms and Cycle of Erosion, p.213

2. The Ganga River System: Course and Confluences (basic)

The Ganga River system is the largest and most significant drainage basin in India. To understand its origin, we must look at it not as a single stream, but as a meeting of several sacred rivers in the high Himalayas of Uttarakhand. The river officially begins its journey at the confluence of two main headwaters: the Bhagirathi and the Alaknanda.

The Bhagirathi is traditionally considered the source stream. It originates from the Gaumukh cave at the base of the Gangotri Glacier in the Uttarkashi district, situated at an elevation of about 7,010 meters Geography of India, The Drainage System of India, p.11. Meanwhile, the Alaknanda rises from the Satopanth Glacier above Badrinath. Before these two giants meet, the Alaknanda flows through a series of five sacred confluences known as the Panch Prayag, where it gathers strength from various tributaries Geography of India, The Drainage System of India, p.12.

The sequence of these confluences is vital for your geography preparation. They occur in the following order as the Alaknanda flows downstream:

Confluence (Prayag)	Tributary joining the Alaknanda
Vishnuprayag	Dhauliganga
Nandprayag	Nandakini
Karnaprayag	Pindar River
Rudraprayag	Mandakini (Kali Ganga)
Devprayag	Bhagirathi

It is only at Devprayag that the river finally assumes the name Ganga. After this final mountain confluence, the river cuts through the Shivalik range and eventually emerges from the hills into the Northern Plains at the holy city of Haridwar CONTEMPORARY INDIA-I, Drainage, p.24. This transition from a high-velocity mountain torrent to a slow-moving, broad river marks the beginning of its life as the lifeline of Northern India.

Sources: Geography of India, The Drainage System of India, p.11-12; CONTEMPORARY INDIA-I, Drainage, p.24

3. Peninsular River Systems: East vs West Flowing (basic)

To understand the Peninsular river system, we must first look at the landscape's history. Unlike the youthful, erratic Himalayan rivers, the Peninsular drainage system is geologically older and more mature. This maturity is visible in the broad, shallow valleys and the graded profiles of the rivers INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23. The primary architect of this drainage pattern is the Western Ghats, which acts as the main water divide. Since the Western Ghats run close to the western coast and the entire Deccan plateau has a gentle slope toward the east, the vast majority of Peninsular rivers are compelled to flow toward the Bay of Bengal.

Most major rivers, including the Godavari, Krishna, Kaveri, and Mahanadi, follow this eastward tilt. Because they travel long distances across relatively flat terrain before reaching the sea, they carry significant sediment and deposit it at their mouths, forming extensive deltas CONTEMPORARY INDIA-I, Drainage, p.21. These rivers are vital for the agricultural economy of the eastern plains. Interestingly, the Eastern Ghats are discontinuous and dissected by these very rivers as they make their way to the coast CONTEMPORARY INDIA-I, Physical Features of India, p.12.

However, geography always has its rebels. The Narmada and the Tapi are the two major exceptions that flow westward. Instead of following the general plateau tilt, they flow through rift valleys (depressions caused by geological faults). Because their course is shorter and often confined by hard rock, they do not carry enough sediment to form deltas; instead, they form estuaries—funnel-shaped openings where fresh water meets the sea CONTEMPORARY INDIA-I, Drainage, p.21.

Feature	East-Flowing Rivers	West-Flowing Rivers
Examples	Godavari, Krishna, Kaveri, Mahanadi	Narmada, Tapi (and small coastal streams)
Mouth Type	Form large Deltas	Form Estuaries
Drainage Area	Large basins	Relatively smaller basins
Destination	Bay of Bengal	Arabian Sea

Sources: CONTEMPORARY INDIA-I, Drainage, p.21; INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23; CONTEMPORARY INDIA-I, Physical Features of India, p.12

4. Radial Drainage and the Amarkantak Plateau (intermediate)

In the study of Indian physiography, understanding how water carves the landscape is essential. One of the most fascinating patterns we encounter is Radial Drainage. Imagine a bicycle wheel; the hub is a central high point, and the spokes radiate outwards in every direction. In geographical terms, this occurs when rivers originate from a central elevated point, such as a volcanic cone or a dome-shaped plateau, and flow down the slopes in different directions Geography of India, The Drainage System of India, p.3.

The Amarkantak Plateau, located at the junction of the Vindhya and Satpura ranges in Madhya Pradesh, is India’s most iconic example of a radial drainage system. It acts as a massive "water divide." From this central highland, two major rivers set off on completely different journeys. The Narmada River flows westward, carving through a rift valley formed by tectonic faulting Contemporary India-I, Drainage, p.21. Meanwhile, the Son River (a major south-bank tributary of the Ganga) flows north and northeast, eventually traversing the Kaimur Range to join the Ganga near Patna Geography of India, The Drainage System of India, p.16. This divergence is why the Amarkantak region is often called a "hydrographic center."

To master this, you must distinguish radial drainage from other common patterns like Dendritic (tree-like branches common in the plains) or Trellis (where tributaries join at right angles in folded mountains). While the Narmada and Son are the stars of Amarkantak, radial patterns also appear in the Girnar Hills of Gujarat and the Mikir Hills of Assam Geography of India, The Drainage System of India, p.3. Understanding these patterns helps us predict soil fertility, irrigation potential, and even the historical settlement patterns of a region.

Feature	Radial Drainage	Dendritic Drainage
Origin	Central high point (Dome/Peak)	Uniform rock structure/Gentle slope
Visual Appearance	Spokes of a wheel	Branches of a tree
Indian Example	Amarkantak (Narmada, Son)	Indo-Gangetic Plain rivers

Sources: Geography of India, The Drainage System of India, p.3, 16; Contemporary India-I, Drainage, p.21; Geography of India, Physiography, p.55

5. River Basins and Major Tributaries (intermediate)

When we look at the map of India, the drainage system of the Peninsular Plateau tells a story of an ancient, stable landscape. Unlike the Himalayan rivers, which are perennial and youthful, these rivers are older and largely seasonal. The two giants of this region are the Godavari and the Krishna, both of which rise in the Western Ghats and journey across the Deccan to the Bay of Bengal.

The Godavari is often referred to as the 'Dakshin Ganga' (Ganga of the South) because it is the largest river system in Peninsular India, stretching over 1,465 km Geography of India, Majid Husain, p.21. It originates at the Trimbak Plateau near Nasik in Maharashtra. One of its most fascinating features is the Pranhita tributary, which is actually the combined flow of the Wardha and Wainganga rivers. While most of its major tributaries like the Purna and Indravati join from the left bank, the Manjira stands out as its only significant right-bank tributary Geography of India, Majid Husain, p.21.

Moving slightly south, we find the Krishna river, the second-largest east-flowing peninsular river. It rises near Mahabaleshwar in the Sahyadri range and flows for about 1,400 km INDIA PHYSICAL ENVIRONMENT, NCERT Class XI, p.24. The Krishna is famous for its "bird-foot" delta, a geographic rarity in India that resembles the Mississippi delta Geography of India, Majid Husain, p.21. Its catchment is shared primarily by Maharashtra, Karnataka, Telangana, and Andhra Pradesh.

Feature	Godavari River	Krishna River
Origin	Trimbak Plateau, Nasik (Maharashtra)	Near Mahabaleshwar (Maharashtra)
Major Tributaries	Pranhita, Indravati, Manjira, Sabari	Tungabhadra, Bhima, Koyna, Musi
Delta Type	Large, branch-based delta at Rajamundri	Bird-foot delta (Mississippi-type)

Beyond these two, we must also note the Narmada (rising from Amarkantak) and the Kaveri (rising from Brahmagiri/Taal Kaveri). The Kaveri is unique because its basin receives rainfall from both the Southwest and Northeast monsoons, making its flow more consistent than other peninsular rivers Geography of India, Majid Husain, p.20.

Sources: Geography of India, Majid Husain, The Drainage System of India, p.20-21; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.24; CONTEMPORARY INDIA-I, Geography, Class IX NCERT, Drainage, p.22

6. Trans-Himalayan Origins and Glaciers (intermediate)

To understand the Trans-Himalayan region, we must first appreciate the concept of antecedent drainage. Unlike many rivers that follow the slope of the land, the great Trans-Himalayan rivers—the Indus, Sutlej, and Brahmaputra—are actually older than the mountains themselves. As the Himalayas rose due to tectonic plates colliding, these rivers maintained their original courses by cutting deep, narrow gorges through the rising peaks. This evolutionary process involved significant headward erosion, where rivers effectively 'ate' back into the land, eventually leading to river capture. For instance, what we now see as separate systems were once part of a massive, westward-flowing 'Shiwalik River' or 'Indo-Brahma' river that was later disrupted and segmented into the drainage patterns we recognize today Geography of India, Majid Husain, p.6. Moving from the rivers to the high-altitude basins, the Himalayan landscape is dotted with spectacular lakes. Most freshwater lakes in this high-altitude region have glacial origins. They were formed when massive glaciers carved out deep basins in the rock; as these glaciers retreated or melted, the hollows were filled with snowmelt Contemporary India-I, Geography, Class IX, p.22. However, not all lakes are formed this way. The Wular Lake in Jammu and Kashmir, for example, is a unique exception as it is the result of tectonic activity, making it the largest freshwater lake in India. The hydrology of this region is not static; it is a story of constant change. Geographers have observed that the Sutlej (ancient Satadru) once flowed differently, but a sudden westward swing near Ropar caused it to join the Indus system. This diversion, combined with the loss of feeding streams for the Drishadvati, is believed to be a primary reason for the drying up of the legendary Saraswati River Geography of India, Majid Husain, p.27. Furthermore, when we look at the ecology of these water bodies, we categorize them by nutrient content. While many Himalayan lakes are eutrophic (nutrient-rich), some high-altitude ones remain oligotrophic (low nutrients), maintaining crystal clear but less biologically productive waters Environment and Ecology, Majid Hussain, p.26.

Comparison of Himalayan Lake Types

Feature	Glacial Lakes	Tectonic Lakes
Formation	Glaciers 'dig out' a basin subsequently filled by snowmelt.	Subsidence or movements in the Earth's crust.
Examples	Bhimtal, Nainital, Gangabal.	Wular Lake.
Water Type	Primarily Freshwater.	Freshwater.

Sources: Geography of India, The Drainage System of India, p.6; Geography of India, The Drainage System of India, p.27; Contemporary India-I, Geography, Class IX, Drainage, p.22; Environment and Ecology, MAJOR BIOMES, p.26

7. Specific Sources of Major South Indian Rivers (exam-level)

To master the geography of Peninsular India, one must first understand the Western Ghats (or Sahyadri) as the primary water divide. Unlike the snow-fed Himalayan rivers, major South Indian rivers like the Godavari and Krishna are rain-fed, meaning their flow depends heavily on the monsoon. While they both originate in the same mountain range in Maharashtra, their specific points of origin are distinct landmarks that are frequently tested in the UPSC Preliminary exam.

The Godavari River is the largest of the Peninsular rivers, often referred to as the Dakshin Ganga. It rises from the slopes of the Western Ghats in the Nasik district of Maharashtra CONTEMPORARY INDIA-I, Geography, Class IX, p.21. Specifically, it originates at Trimbakeshwar. As it flows roughly 1500 km toward the Bay of Bengal, it gathers water from massive tributaries like the Pranhita, Wainganga, and Manjra. Interestingly, the river forms a stunning gorge south of Polavaram before splitting into several branches near Rajamundri to form a vast delta INDIA PHYSICAL ENVIRONMENT, Geography Class XI, p.24.

The Krishna River, the second-largest east-flowing peninsular river, originates further south from the vertical faces of the Western Ghats near Mahabaleshwar Geography of India, Majid Husain, p.21. While the Godavari's basin is dominated by Maharashtra (50%), the Krishna's catchment is more distributed across Karnataka (44%) and Andhra Pradesh/Telangana (29%) INDIA PHYSICAL ENVIRONMENT, Geography Class XI, p.24. The Krishna is famous for its "bird-foot" delta — a shape similar to the Mississippi River — and the massive Nagarjun-Sagar Reservoir constructed along its path.

River	Specific Source	Key Tributaries
Godavari	Nasik (Trimbakeshwar), Maharashtra	Penganga, Wainganga, Wardha, Manjra
Krishna	Mahabaleshwar (Sahyadri), Maharashtra	Tungbhadra, Bhima, Koyna, Ghataparbha

Sources: CONTEMPORARY INDIA-I, Geography, Class IX, Drainage, p.21; INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Drainage System, p.24; Geography of India, Majid Husain, The Drainage System of India, p.21

8. Solving the Original PYQ (exam-level)

You have just mastered the framework of India’s drainage systems, and this PYQ is the perfect test of your ability to link physiographic features with specific river systems. As detailed in India: Physical Environment (NCERT Class XI), the drainage network is broadly categorized into Himalayan and Peninsular rivers. This question requires you to move beyond general patterns and recall the exact water-divide points and glaciers that serve as the birthplaces for these major lifelines. By connecting your knowledge of the Central Highlands and the Western Ghats, the building blocks of Indian geography come together to form a clear map of river origins.

To arrive at the correct answer, let’s apply a systematic elimination strategy. Start with the most iconic pair: the Ganga originates from the Gangotri glacier near Gaumukh (A-2). Next, recall the unique northward-flowing Son river, which rises in the Amarkantak plateau (B-1). Identifying these two immediately points you toward correct answer (D). To verify the remaining pairs, remember that the Godavari (the longest Peninsular river) starts at Trimbakeshwar near Nashik (C-4), while the Krishna river begins its journey at Mahabaleshwar (D-3). This structured approach ensures you aren't overwhelmed by the list and can confirm your choice through multiple data points.

UPSC often sets distractor traps to catch students who rely on superficial memorization. In this question, Mansarovar (Option 5) is a classic distractor meant to confuse the Ganga with trans-Himalayan rivers like the Indus, Satluj, or Brahmaputra. Furthermore, the examiner frequently swaps the origins of the Godavari and Krishna because both are located in the Western Ghats of Maharashtra. Focusing on the subtle distinction between the Nashik region (Trimbakeshwar) and the Satara region (Mahabaleshwar) is what separates a prepared candidate from the rest of the field.