Arrange the following hills of southern India from north to south : 1. Nilgiri 2. Cardamom 3. Nallamala 4. Anaimalai Select the correct answer using the code given below :

1. Physiography of the Peninsular Plateau (basic)

Welcome! Let's begin our journey into the heart of India with the Peninsular Plateau. Imagine a massive, ancient triangular tableland that stands as the oldest and most stable landmass in the country. It was formed millions of years ago when the supercontinent Gondwanaland broke apart and drifted, leaving behind this rugged terrain of crystalline, igneous, and metamorphic rocks Contemporary India-I, Physical Features of India, p.12.

The plateau is broadly divided into two parts: the Central Highlands (north of the Narmada river) and the Deccan Plateau (the triangle south of the Narmada). A unique feature you must remember is the tilt of the land. The Deccan Plateau is generally higher in the west and slopes gently toward the east Contemporary India-I, Physical Features of India, p.12. This explains why most of South India's mighty rivers, like the Godavari and Krishna, flow toward the Bay of Bengal.

To truly master this geography, we must look at the Western and Eastern Ghats, which act as the edges of this plateau. As we move from the central part of India down to the southern tip, the hills follow a specific latitudinal (North-to-South) sequence that is very popular in geography assessments:

• Nallamala Hills: Located primarily in Andhra Pradesh and Telangana, these are part of the Eastern Ghats.
• Nilgiri Hills: Known as the "Blue Mountains," this is the famous mountain knot where the Western and Eastern Ghats meet.
• Anaimalai Hills: Situated just south of the Palghat Gap; they host Anaimudi, the highest peak in South India.
• Cardamom Hills: The southernmost range, named after the spice that grows abundantly in its cool, moist climate.

Feature	Western Ghats	Eastern Ghats
Continuity	Continuous; can be crossed only through passes (like Palghat).	Discontinuous and irregular; dissected by rivers.
Elevation	Higher (900–1600 m).	Lower (average 600 m).

Sources: Contemporary India-I, Physical Features of India, p.12; Geography of India, Physiography, p.57; India Physical Environment, Structure and Physiography, p.12

2. The Western Ghats: Continuous Ranges and Peaks (intermediate)

The Western Ghats, also known as the Sahyadris, represent one of the world's most significant biodiversity hotspots and a formidable mountain barrier running parallel to India's western coast. Unlike the Eastern Ghats, which are broken and dissected by major rivers, the Western Ghats are relatively continuous. They can be crossed only through specific passes or gaps, such as the Thal Ghat and Bhor Ghat in the north, and the Palghat Gap in the south Geography of India, Majid Husain, Physiography, p.58. A defining characteristic of this range is that its elevation progressively increases from north to south CONTEMPORARY INDIA-I ,Geography, Class IX, Physical Features of India, p.12.

In the northern and central sections, the range features notable peaks like Kalsubai (1646 m) in Maharashtra and Kudremukh (1892 m) in Karnataka Geography of India, Majid Husain, Physiography, p.58. However, the most dramatic topography is found at the Nilgiri Hills. This area serves as a mountain knot where the Eastern Ghats and the Western Ghats converge Geography of India, Majid Husain, Physiography, p.58. The Nilgiris house the famous Doddabetta peak (2637 m), which was long considered a primary height of the region.

South of the Nilgiris lies the Palghat (Palakkad) Gap, a major mountain pass that breaks the continuity of the range. Directly south of this gap are the Anaimalai Hills, home to Anaimudi (2695 m) — the highest peak in both the Western Ghats and the entire Peninsular India Geography of India, Majid Husain, Natural Vegetation and National Parks, p.55. Extending further south toward the tip of India are the Cardamom Hills. To place these in a broader context, ranges like the Nallamala Hills are part of the Eastern Ghats and are located further north and east compared to this southern Western Ghats cluster INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Structure and Physiography, p.12.

Region	Key Hills / Ranges	Notable Peaks
Maharashtra/North	Sahyadris	Kalsubai, Mahabaleshwar
Karnataka/Central	Baba Budan, Kudremukh	Kudremukh, Pushpagiri
Tamil Nadu/Kerala Border	Nilgiris (The Knot)	Doddabetta
South of Palghat Gap	Anaimalai & Cardamom	Anaimudi (Highest)

Sources: Geography of India, Majid Husain, Physiography, p.58; CONTEMPORARY INDIA-I ,Geography, Class IX, Physical Features of India, p.12; Geography of India, Majid Husain, Natural Vegetation and National Parks, p.55; INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Structure and Physiography, p.12

3. The Eastern Ghats: Discontinuous Hill Ranges (intermediate)

The Eastern Ghats represent the eastern edge of the Peninsular Plateau, running nearly parallel to the Bay of Bengal. Unlike their western counterparts, the Eastern Ghats are discontinuous, irregular, and highly denuded. This lack of continuity is their most defining geographical trait; they have been cut through by massive, east-flowing rivers like the Mahanadi, Godavari, Krishna, and Kaveri as these rivers drain into the Bay of Bengal CONTEMPORARY INDIA-I, Geography, Class IX, Physical Features of India, p.12.

Geologically, these ranges are very old and composed of diverse rock types, predominantly Khondalites (metamorphosed sedimentary rocks) and Charnockites. Because they have been subjected to millions of years of erosion, they are much lower in elevation than the Western Ghats, with their heights generally ranging between 600 to 900 meters. Important peaks in this region include Mahendragiri (1,501m) in Odisha and several higher peaks in the Araku Valley region, such as Jindhagada Geography of India, Majid Husain, Physiography, p.62.

As you move from North to South, the Eastern Ghats appear as a series of distinct hill ranges with local names. In Andhra Pradesh and Telangana, you will find the Nallamala, Velikonda, Palkonda, and Erramala ranges. Further south, into Tamil Nadu, the system continues through the Javadi and Shevaroy Hills Geography of India, Majid Husain, Physiography, p.62. Eventually, the Eastern Ghats lose their distinct identity as they merge with the Western Ghats at the Nilgiri Hills, creating a massive "mountain knot" that anchors the southern part of the peninsula.

Feature	Western Ghats	Eastern Ghats
Continuity	Continuous (crossed only through passes)	Discontinuous (dissected by rivers)
Average Elevation	Higher (approx. 900–1600m)	Lower (approx. 600m)
Slope	Steep western face	Gentle and highly eroded

Sources: CONTEMPORARY INDIA-I, Geography, Class IX, Physical Features of India, p.12; Geography of India, Majid Husain, Physiography, p.62

4. Mountain Gaps and Strategic Passes of the South (exam-level)

While the Himalayan passes are famous for their extreme altitudes and snowy barriers, the mountain gaps of Peninsular India serve a different, yet equally vital, strategic role. These gaps are physical breaks in the otherwise continuous wall of the Western Ghats (Sahyadris) and the discontinuous Eastern Ghats. They act as 'gateways' for trade, transport, and even the Southwest Monsoon winds that bring life to the Deccan Plateau. Understanding these requires a clear mental map of the hill ranges, starting from the Nallamala Hills in the north (part of the Eastern Ghats in Andhra Pradesh) and moving down to the Nilgiri Hills, where the two great ghats meet in a 'mountain knot' India Physical Environment, Chapter 2, p.12. In the northern Western Ghats, the two most critical corridors are the Thal Ghat and the Bhor Ghat. The Thal Ghat (also known as Kasara Ghat) serves as the primary link between Mumbai and Nashik, carrying the vital National Highway 3 and major rail lines toward North India Geography of India, Chapter 2, p.61. Just south of this lies the Bhor Ghat, which connects Mumbai to Pune. Historically and commercially, the Bhor Ghat is one of the busiest passes in India, providing the essential climb from the Konkan coast to the Deccan Plateau Geography of India, Chapter 2, p.59. Moving further south, the geography becomes more complex as we hit the Palghat Gap. This is a significant 30 km wide break in the Western Ghats located between the Nilgiri Hills to the north and the Anaimalai Hills to the south. Unlike the narrow northern ghats, the Palghat Gap allows the moisture-laden monsoon winds to penetrate deep into the interior of Tamil Nadu. South of the Anaimalai range (which hosts Anamudi, the highest peak of South India), we find the Cardamom Hills. Near the southern tip lies the Shencottah Gap, a low-level pass that connects the city of Madurai in Tamil Nadu with Kollam in Kerala, facilitating ancient trade routes of spices and textiles.

Pass/Gap	Region Connected	Key Feature
Thal Ghat	Mumbai to Nashik	Major link to Central/North India
Bhor Ghat	Mumbai to Pune	One of the busiest commercial passes
Palghat Gap	Coimbatore to Palakkad	30km wide break; climatic significance
Shencottah Gap	Madurai to Kollam	Connects Southern TN and Kerala

Sources: Geography of India, Chapter 2: Physiography, p.59, 61; India Physical Environment, Chapter 2: Structure and Physiography, p.12

5. Drainage Systems and River-Hill Interplay (exam-level)

To master the geography of Southern India, one must visualize the landscape as a grand staircase of hills descending toward the tip of the peninsula, deeply intertwined with the rivers that carve through them. The structural backbone starts in the north with the Nallamala Hills, a significant range of the Eastern Ghats in Andhra Pradesh and Telangana. As we move south, we reach the Nilgiri Hills—often called the 'Blue Mountains'—which serve as the critical mountain knot where the Western and Eastern Ghats converge Geography of India, Majid Husain, Chapter 2, p.58. This sequence continues south across the Palghat Gap (a major low mountain pass) into the Anaimalai Hills and finally the Cardamom Hills, which form the southernmost reaches of the Western Ghats INDIA PHYSICAL ENVIRONMENT, NCERT Class XI, Chapter 2, p.12.

The Kaveri River (or Cauvery) is the most iconic example of river-hill interplay in this region. Rising in the Brahmagiri hills of Karnataka, it performs a unique hydrological feat. Unlike most Peninsular rivers that run dry in winter, the Kaveri remains relatively perennial. This is because its upper catchment (Karnataka) receives rainfall from the Southwest monsoon (summer), while its lower catchment (Tamil Nadu) is fed by the Northeast monsoon (winter) INDIA PHYSICAL ENVIRONMENT, NCERT Class XI, Chapter 3, p.24. As it descends from the Deccan Plateau, it carves through dramatic gorges, such as the Hagenakal Falls, and creates a deep valley in the Nilgiris near the Moyar tributary Geography of India, Majid Husain, Chapter 3, p.21.

Hill Range	Key Geographic Role	Associated River/Feature
Nallamala	Northern section of the Eastern Ghats	Krishna River basin proximity
Nilgiri	Junction of Western & Eastern Ghats	Kaveri tributaries (Moyar, Bhavani)
Anaimalai	South of Palghat Gap; highest peaks	Source of many West-flowing streams
Cardamom	Southernmost tip of the Western Ghats	Periyar River origin

Finally, the Periyar River, originating in the Cardamom Hills, showcases how humans have adapted to this hill-river interplay. Through the Periyar Diversion Scheme, water that naturally flows west toward the Arabian Sea is diverted through a tunnel across the mountains to the east. This engineering marvel provides life-giving water to the rain-shadow regions of Tamil Nadu, proving that in Indian geography, hills are not just barriers but also the controllers of water distribution Geography of India, Majid Husain, Chapter 3, p.43.

Sources: Geography of India, Majid Husain, Chapter 2: Physiography, p.58, 61; INDIA PHYSICAL ENVIRONMENT, NCERT Class XI, Chapter 2: Structure and Physiography, p.12; INDIA PHYSICAL ENVIRONMENT, NCERT Class XI, Chapter 3: Drainage System, p.24; Geography of India, Majid Husain, Chapter 3: The Drainage System of India, p.21, 38, 43

6. Latitudinal Mapping of Southern Hill Ranges (exam-level)

When mapping the southern hill ranges of India, we must transition from the fragmented Eastern Ghats to the more continuous Western Ghats. The northernmost range in this specific sequence is the Nallamala Hills. Situated primarily in Andhra Pradesh and Telangana, these hills represent the older, highly eroded, and discontinuous nature of the Eastern Ghats INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 2, p.13. They sit roughly between 15°N and 16°N latitude, significantly north of the deep southern mountain blocks.

As we move further south, we encounter the Nilgiri Hills, often referred to as the 'Blue Mountains'. Geographically, the Nilgiris serve as the mountain knot where the Eastern Ghats and Western Ghats converge Geography of India, Majid Husain (McGrawHill 9th ed.), Chapter 2, p.61. This range is home to Dodabetta (2,637 m), which was long considered the highest point in the south before more precise measurements highlighted peaks further south. The Nilgiris sit at approximately 11°N latitude.

The sequence continues southward across a major tectonic break known as the Palghat Gap. South of this gap lie the Anaimalai Hills (Elephant Hills), which host Anaimudi (2,695 m) — the highest peak of the entire Peninsular plateau INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 2, p.13. Finally, reaching the southern tip of the Indian peninsula (around 9°N), we find the Cardamom Hills. These are so named because of the cardamom spice grown in their cool, moist elevations and are the southernmost extension of the Western Ghats before they taper off toward Kanyakumari.

Hill Range	Regional Association	Approx. Latitude
Nallamala Hills	Eastern Ghats (Andhra/Telangana)	15° - 16° N
Nilgiri Hills	Western/Eastern Ghats Junction	11° N
Anaimalai Hills	Western Ghats (South of Palghat)	10° N
Cardamom Hills	Western Ghats (Southern Tip)	9° N

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Chapter 2: Structure and Physiography, p.12-13; Geography of India, Majid Husain (McGrawHill 9th ed.), Chapter 2: Physiography, p.61

7. Solving the Original PYQ (exam-level)

This question effectively synthesizes your knowledge of the Physiographic divisions of Peninsular India, specifically the spatial relationship between the Eastern and Western Ghats. To solve this, you must recall that the Nallamala Hills are situated in the Eastern Ghats (Andhra Pradesh and Telangana), which places them significantly further north than the complexes of the deep south. As your mental map moves southward, you encounter the Nilgiri Hills, which act as the "mountain knot" where the Eastern and Western Ghats converge. The final part of the sequence requires distinguishing between the ranges south of the Palghat Gap: the Anaimalai Hills (featuring Anamudi, the highest peak) come first, followed by the Cardamom Hills, which extend toward the southern tip of the peninsula. As noted in NCERT Class XI: India Physical Environment and Geography of India by Majid Husain, this latitudinal progression from roughly 16°N down to 9°N is a core geographical framework of South India.

Walking through the reasoning, your first step should be identifying Nallamala (3) as the northernmost outlier. From there, you look for the junction point, the Nilgiris (1). The most common point of confusion is the order of the two southernmost ranges; however, remembering that the Cardamom hills are the final major range before Kanyakumari confirms the 4-2 sequence. This logical deduction leads directly to Option (A) 3-1-4-2. Many students fall into the trap of Option (C) by incorrectly assuming the Nilgiris are further north than the Nallamala range, or Option (B) by reversing the order of the ranges situated around the Palghat Gap. UPSC frequently uses these "relative positioning" questions to test if you can visualize the map rather than just memorizing names.