In India, which of the following are the southernmost hills ?

1. Physiography of the Peninsular Plateau (basic)

Welcome to your first step in mastering the mountains of India! To understand the peaks and ranges, we must first look at the massive foundation they sit upon: the Peninsular Plateau. This is not just any piece of land; it is the oldest and most stable landmass in India. Geologically, it was formed from the breaking and drifting of the ancient supercontinent Gondwanaland, making it a region of ancient crystalline, igneous, and metamorphic rocks CONTEMPORARY INDIA-I, Physical Features of India, p.12.

Imagine a giant, irregular triangle tilted slightly toward the east. The broad base of this triangle lies in the north, while its apex points toward Kanyakumari in the south. Because of this eastward tilt, most major rivers like the Godavari and Krishna flow toward the Bay of Bengal. However, this plateau isn't one flat block; it is divided into two broad regions by the Narmada River: the Central Highlands to the north and the Deccan Plateau to the south CONTEMPORARY INDIA-I, Physical Features of India, p.12.

One of the most fascinating features of this plateau is its "hidden" extension. While we often think of it ending at the Rajmahal Hills in the east, the plateau actually extends further northeast into Meghalaya (forming the Garo, Khasi, and Jaintia Hills) and the Karbi-Anglong Plateau. It is separated from the main block by a massive geological fault known as the Malda Gap CONTEMPORARY INDIA-I, Physical Features of India, p.12. The edges of this great plateau are guarded by mountain ranges—the Western Ghats and the Eastern Ghats—which we will explore in detail as we progress through our journey.

Feature	Central Highlands	Deccan Plateau
Location	North of the Narmada River	South of the Narmada River
Major Ranges	Vindhyas, Aravalis	Satpura, Western & Eastern Ghats
General Slope	Southwest to Northeast	West to East

Sources: CONTEMPORARY INDIA-I, Physical Features of India, p.7; CONTEMPORARY INDIA-I, Physical Features of India, p.12; Geography of India (Majid Husain), Physiography, p.57

2. The Western Ghats (Sahyadris) (basic)

The Western Ghats, also known as the Sahyadris, are a magnificent mountain range that runs parallel to the western coast of India. Unlike the Himalayas, which are young fold mountains, the Western Ghats are technically the faulted edge of the Deccan Plateau. They stretch roughly 1,600 km from the mouth of the Tapi river in Gujarat all the way down to Kanyakumari, covering six states: Gujarat, Maharashtra, Goa, Karnataka, Tamil Nadu, and Kerala Geography of India, Majid Husain, p.55. One of their most defining features is their continuity; unlike the Eastern Ghats, which are broken and irregular, the Western Ghats can only be crossed through specific mountain passes known as Ghats, such as the Thal Ghat and Bhor Ghat in Maharashtra, and the Palakkad (Palghat) Gap further south Contemporary India-I, Geography, Class IX, p.12.

Physically, the Western Ghats are significantly higher than their eastern counterparts, with an average elevation ranging between 900 and 1,600 metres. An interesting geographical trend is that their height generally increases from north to south. In the north, peaks like Kalsubai (1,646 m) are prominent, but as you move south towards the Nilgiri Hills, the range forms a massive "mountain knot" where it meets the Eastern Ghats Geography of India, Majid Husain, p.58. South of the Nilgiris lies the Anaimalai Hills, home to Anaimudi (2,695 m), which is the highest peak in the entire Peninsular India.

The Western Ghats act as a giant wall that intercepts the moisture-laden Southwest Monsoon winds. This forced ascent of air causes heavy orographic rainfall on the western slopes, making them lush and green, while the eastern side remains a rain-shadow area Contemporary India-I, Geography, Class IX, p.12. Because of this high rainfall and varied topography, the region is recognized as one of the world's hottest biodiversity hotspots, hosting thousands of species of flora and fauna found nowhere else on Earth Geography of India, Majid Husain, p.55.

Feature	Western Ghats (Sahyadris)	Eastern Ghats
Continuity	Continuous; crossed only through passes.	Discontinuous; dissected by rivers.
Avg. Elevation	900 – 1600 metres (Higher)	~600 metres (Lower)
Highest Peak	Anaimudi	Mahendragiri/Jindhagada

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

3. The Eastern Ghats and the Nilgiri Junction (intermediate)

While the Western Ghats stand like a continuous wall, the Eastern Ghats are far more modest and fragmented. They represent an ancient, highly eroded mountain chain that stretches from the Mahanadi Valley in the north to the Nilgiri Hills in the south CONTEMPORARY INDIA-I, Geography, Class IX, p.12. Unlike their western counterparts, the Eastern Ghats are discontinuous and irregular because they have been carved out by major peninsular rivers like the Godavari, Krishna, and Cauvery as they race toward the Bay of Bengal Geography of India, Majid Husain, p.61.

Geologically, the Eastern Ghats are a series of detached hills with distinct local names. As we move from north to south, we encounter various sub-ranges such as the Nallamala, Velikonda, Palkonda, and Erramala ranges in Andhra Pradesh, followed by the Javadi and Shevaroy hills in Tamil Nadu Geography of India, Majid Husain, p.62. The highest peak in this system is often cited as Arma Konda (or Jindhagada) with an elevation of approximately 1,680 metres, which is significantly lower than the towering peaks of the Western Ghats.

The Nilgiri Hills serve as the grand finale where these two great mountain systems converge. Known as a "Mountain Knot," the Nilgiris act as the geographical bridge between the Eastern and Western Ghats Geography of India, Majid Husain, p.58. It is important to note that while the Eastern Ghats technically end at this junction, the Western Ghats continue further south, beyond the Palghat Gap, into the Anaimalai and Cardamom ranges.

Feature	Western Ghats	Eastern Ghats
Continuity	Continuous; crossed only through passes (Thal, Bhor, Pal Ghats).	Discontinuous; dissected by east-flowing rivers.
Average Elevation	900 – 1600 metres.	Approx. 600 metres.
Rainfall	Cause heavy orographic rain on western slopes.	Rainfall is lower and more seasonal.

Sources: CONTEMPORARY INDIA-I, Geography, Class IX, Physical Features of India, p.12; Geography of India, Majid Husain, Physiography, p.58, 61, 62; INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Structure and Physiography, p.12

4. Major Mountain Passes of South India (intermediate)

To understand the geography of South India, one must first appreciate the character of the Western Ghats (Sahyadris). Unlike the Eastern Ghats, which are highly dissected and broken, the Western Ghats are a nearly continuous wall of mountains running parallel to the Arabian Sea. Because they are so continuous, mountain passes (locally often called 'Ghats' or 'Gaps') have historically been the only lifelines for trade, migration, and the movement of the monsoon winds between the coastal plains and the interior plateau Majid Husain, Physiography, p.58.

In the northern segment (Maharashtra), the two most critical passes are the Thal Ghat and the Bhor Ghat. The Thal Ghat (also known as Kasara Ghat) serves as the primary gateway from Mumbai to Nashik and onwards to North India, carrying the vital Bhopal-Indore railway line Majid Husain, Physiography, p.61. Just south of it lies the Bhor Ghat, which connects Mumbai to Pune. This is arguably the busiest pass in the region, acting as the main artery for commercial traffic and high-speed rail between the financial capital and the Deccan interior Majid Husain, Physiography, p.59.

Moving further south, the topography becomes more complex. The Western and Eastern Ghats converge at the Nilgiri Hills, creating a massive mountain knot. Just south of the Nilgiris, the continuity of the Sahyadris is finally broken by the Palghat Gap (Palakkad Gap). This 30km wide corridor is a geological marvel that separates the Nilgiris from the Anaimalai Hills. It is the most significant gap in the entire Western Ghats, allowing the moisture-laden Southwest Monsoon winds to penetrate into the rain-shadow regions of Tamil Nadu Majid Husain, Physiography, p.58. Even further south, nestled near the Cardamom Hills, is the Shencottah Gap, which facilitates the connection between the cities of Kollam in Kerala and Madurai in Tamil Nadu.

Major Passes Comparison

Pass Name	Connectivity	Key Geographic Context
Thal Ghat	Mumbai — Nashik	Northern Sahyadri; major rail/road link to North India.
Bhor Ghat	Mumbai — Pune	Extremely high traffic; links the coast to the Deccan Plateau.
Palghat Gap	Palakkad — Coimbatore	Separates Nilgiris and Anaimalai Hills; crucial for climate.
Shencottah Gap	Kollam — Madurai	Located in the southern extremity near Cardamom Hills.

Sources: Geography of India, Majid Husain, Physiography, p.58; Geography of India, Majid Husain, Physiography, p.59; Geography of India, Majid Husain, Physiography, p.61

5. Highest Peaks and Drainage Systems (exam-level)

To master the geography of India, one must understand that mountain ranges are more than just high altitudes; they are the primary water divides that dictate the country's drainage systems. In the North, the Great Himalayas house the world's highest peaks, such as Kanchenjunga (8,598m) and Nanda Devi (7,817m), acting as a massive barrier that feeds the perennial Indus, Ganga, and Brahmaputra systems CONTEMPORARY INDIA-I, Physical Features of India, p.8. However, for the UPSC, the nuances of the Peninsular mountains are equally critical, particularly the Western Ghats (Sahyadris). Unlike the Himalayas, the Western Ghats show a unique progressive increase in height from North to South. While peaks in the northern Sahyadris like Kalsubai (1,646m) and Mahabaleshwar (1,438m) are significant, they are dwarfed by the southern giants Geography of India, Physiography, p.58. The range reaches its climax at the Nilgiri Hills, which serve as a 'mountain knot' where the Eastern and Western Ghats meet. South of the Nilgiris, across the Palghat Gap, the mountains continue as the Anaimalai and Cardamom Hills. The highest point in all of South India is Anamudi (2,695m), located in the Anaimalai Hills of Kerala Exploring Society: India and Beyond, Landforms and Life, p.45. In contrast, the Eastern Ghats are lower, discontinuous, and highly eroded by rivers like the Godavari and Krishna. Their highest peak is Mahendragiri (1,501m) CONTEMPORARY INDIA-I, Physical Features of India, p.12. Understanding this elevation gradient is vital because it explains why most major peninsular rivers flow from West to East, following the tilt of the plateau.

Region	Highest Peak	Key Characteristic
Himalayas (India)	Kanchenjunga	Asymmetrical folds; source of perennial rivers.
Western Ghats	Anamudi	Continuous range; height increases North to South.
Eastern Ghats	Mahendragiri	Discontinuous; eroded by eastward-flowing rivers.
Nilgiris	Doddabetta	The junction point of Eastern and Western Ghats.

Sources: CONTEMPORARY INDIA-I, Physical Features of India, p.8, 12; Exploring Society: India and Beyond, Landforms and Life, p.45; Geography of India, Physiography, p.58

6. North-to-South Sequence of Southern Hills (exam-level)

To understand the layout of Southern India, we must look at the Deccan Plateau as a tapering triangle. As we move south, the Western Ghats and Eastern Ghats converge at a 'mountain knot' known as the Nilgiri Hills Geography of India (Majid Husain), Physiography, p.58. This area is famous for the Doddabetta peak INDIA PHYSICAL ENVIRONMENT, Chapter 2, p.16. From this point downward, the mountains don't just stop; they continue in a distinct North-to-South sequence that is a favorite for examiners.

Immediately south of the Nilgiris, the mountain chain is broken by the Palghat Gap (also called the Palakkad Gap), a low mountain pass that serves as a vital corridor between Kerala and Tamil Nadu. South of this gap, the range rises again as the Anaimalai Hills. This range is home to Anamudi (2,695 m), which is the highest peak in all of South India Geography of India (Majid Husain), Physiography, p.58. Further south still, the mountains transition into the Cardamom Hills, so named because of the spice cultivation there. These are effectively the southernmost major hill ranges of India, extending down toward the Agasthyamalai region before the land narrows toward Kanyakumari.

Region (North to South)	Key Feature
Nilgiri Hills	The 'Knot' where Eastern and Western Ghats meet.
Palghat Gap	The major geographical break/pass south of Nilgiris.
Anaimalai Hills	Location of Anamudi, the highest peak of the peninsula.
Cardamom Hills	The southernmost range, famous for spices and biodiversity.

While the Western Ghats follow this clear vertical spine, the Eastern Ghats also contribute to the southern landscape. Ranges like the Javadi Hills and Shevaroy Hills are situated in northern Tamil Nadu. When looking at a map, these Eastern Ghats outliers generally sit north of the latitude where the Cardamom Hills are located Geography of India (Majid Husain), Physiography, p.62.

Sources: Geography of India (Majid Husain), Physiography, p.58; INDIA PHYSICAL ENVIRONMENT, Structure and Physiography, p.16; Geography of India (Majid Husain), Physiography, p.62

7. Solving the Original PYQ (exam-level)

Now that you have mastered the physiographic divisions of the Deccan Plateau, this question tests your ability to visualize the spatial arrangement of the Western Ghats. You've learned that the Western Ghats are a continuous range that increases in elevation toward the south, but they are also segmented. This question requires you to synthesize your knowledge of the mountain "knot" and the subsequent gaps to identify the absolute southern terminus of the Indian peninsula's mountainous spine.

To arrive at the correct answer, visualize a descent down the map: starting from the Nilgiri hills (the junction of the Eastern and Western Ghats), you move south across the Palghat Gap to the Anaimalai hills. While the Anaimalai range is famous for hosting the highest peak in South India, the range that extends even further south, bordering Kerala and Tamil Nadu, is the Cardamom hills. As noted in Geography Class XI (NCERT 2025 ed.), these hills represent the final major segment of the Western Ghats before the subcontinent tapers into the Indian Ocean, making Cardamom hills the definitive answer.

UPSC often uses proximity traps to confuse candidates. For instance, the Javadi hills are part of the Eastern Ghats in northern Tamil Nadu—far to the northeast of our target. The Nilgiri and Anaimalai options are common decoys because they are indeed prominent southern features, but they serve as "stepping stones" rather than the final destination. To avoid these traps, always recall the latitudinal hierarchy: the mountain sequence descends from Nilgiri to Anaimalai and finally terminates at the Cardamom hills.