Biodiversity Hotspots in India: The 4 for UPSC

By Dooit UPSC expert · 24 August 2026 · 9 min read

India has four biodiversity hotspots — the Himalaya, Indo-Burma, the Western Ghats and Sri Lanka, and Sundaland — and every one of them spills across our borders into neighbouring countries. They are four of the 36 hotspots recognised worldwide. Get those four names, their two qualifying criteria, and one famous island trap right, and you have locked in a question that appears in Prelims almost every alternate year.

In three decades of coaching, I have seen this topic hand away easy marks to prepared candidates and quietly punish the careless. It looks like simple GK — "name the hotspots in India" — but the examiner rarely asks it that plainly. They ask which hotspot the Nicobar Islands belong to, or whether a hotspot lies entirely within India, or what the exact criteria are. This article gives you the whole thing the way I teach it in class: the concept, the four hotspots with real detail, the traps, and a memory method that actually sticks. Read it once with attention and you will not forget it before the exam.

What exactly is a biodiversity hotspot?

A biodiversity hotspot is not simply a place with a lot of wildlife. It is a precise, threshold-based category. The term was coined by the British ecologist Norman Myers in 1988, and the global list is maintained today by the organisation Conservation International. To qualify as a hotspot, a region must meet two conditions at the same time — and the "at the same time" is the part aspirants forget.

Why plants and not tigers or birds? Because plants form the base of every ecosystem — they are the producers on which all other life depends. If a region has thousands of unique plant species, the animal endemism almost always follows. And why insist on the 70 percent habitat loss? Because the whole point of the "hotspot" idea is conservation triage. Myers was trying to answer a hard question: with limited money and time, where should the world concentrate its protection efforts to save the most unique life from the greatest danger? Hotspots are, by definition, the places where extraordinary richness meets extraordinary threat.

Here is a figure worth memorising because it captures the paradox perfectly: the world's hotspots together cover only about 2.4 percent of the Earth's land surface, yet they hold more than half of the world's plant species and close to 43 percent of its birds, mammals, reptiles and amphibians as endemics. A tiny sliver of land carrying an outsized share of life. That single sentence is often enough to answer a statement-based question.

The 4 biodiversity hotspots in India

India is one of the world's 17 megadiverse countries, and four global hotspots reach into our territory. The single most important thing to understand — and the thing examiners test hardest — is that not one of these four lies entirely within India. Each is a transboundary region shared with neighbours. Study the table below until the four names, their Indian portions and their shared countries come to you instantly.

1. The Himalaya

The youngest and highest mountains on the planet, stretching in a great arc across northern India and into Nepal and Bhutan. The staggering altitude range — from foothill forests to alpine meadows to permanent snow — packs an enormous variety of habitats into a small horizontal distance, which is exactly why endemism is so high here. It is home to charismatic species such as the snow leopard, the red panda, the Himalayan tahr and the takin, and to thousands of endemic flowering plants. The eastern Himalaya in particular is one of the richest botanical zones on Earth.

2. Indo-Burma

One of the most biologically rich and, sadly, most threatened hotspots in the world. Its Indian share is the North-East (the hill states south of the Brahmaputra) together with the Andaman Islands. This region has produced a stream of new species discoveries in recent decades — freshwater turtles, fish, even large mammals — and holds remarkable diversity of primates and birds. Remember the North-East here, and remember that the Andamans belong to Indo-Burma, not to Sundaland.

3. The Western Ghats and Sri Lanka

The one hotspot most aspirants can name — and rightly so. The Western Ghats run parallel to India's western coast through six states — Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu — and are famous for their exceptional endemism: a very large share of the region's amphibians, reptiles and freshwater fish are found nowhere else. The Ghats also perform a vital ecological service by intercepting the south-west monsoon, which shapes the climate of peninsular India. The range was inscribed as a UNESCO World Heritage Site in 2012. Species you should be able to name include the lion-tailed macaque, the Nilgiri tahr and the Malabar civet.

4. Sundaland

The least-known of India's four, and therefore the favourite of a tricky examiner. Sundaland is a South-East Asian hotspot centred on the Malay Peninsula and the great islands of Sumatra, Borneo and Java. Its only Indian toehold is the Nicobar Islands. If you take away one non-obvious fact from this article, take this: the Nicobar Islands sit in Sundaland, while the Andaman Islands sit in Indo-Burma. Two neighbouring island groups, two different hotspots.

Why hotspots are worth protecting — and why they are shrinking

The value of a hotspot is not sentimental. These regions are living libraries of genetic material — the wild relatives of crops, the sources of countless medicines, the pollinators and water-regulators that entire economies quietly depend on. When you lose an endemic species, you lose it from the planet, permanently; there is no other population anywhere to recover it from. That irreversibility is what makes hotspot conservation a global priority rather than a local hobby.

And the threats are real and current. The very criterion that defines a hotspot — 70 percent habitat already lost — tells you these are landscapes under pressure. Deforestation, expanding agriculture and plantations, infrastructure and dams, mining, invasive species, and now climate change are all chipping away at them. The Western Ghats, for instance, continues to lose forest cover year on year, which is why debates over eco-sensitive zones in the Ghats keep returning to the news and, therefore, to your Mains answer sheets.

How UPSC actually asks this — and how to answer

In Prelims, expect factual and statement-based questions: "How many of the world's biodiversity hotspots are found in India?", "Which of the following islands is part of the Sundaland hotspot?", or a match-the-following linking hotspots to species or states. In Mains GS Paper III, the demand shifts to analysis — the pressures on the Western Ghats, the tension between development and conservation, or the effectiveness of India's protected-area network in safeguarding these regions. Prepare both layers from a single set of notes.

A word on the neighbouring concepts, because examiners deliberately mix them up. A biodiversity hotspot is a global category defined by endemism and threat. Do not confuse it with a biosphere reserve (a nationally notified conservation unit, some of which join UNESCO's world network), a national park or wildlife sanctuary (legal protected-area categories under Indian law), or a Ramsar site (an internationally important wetland). These are different frameworks with different criteria, and a single sloppy question can test whether you know the difference. If your protected-area basics feel shaky, work through our companion guide to national parks and wildlife sanctuaries in India before you sit a mock.

Where to fit this in your preparation

Biodiversity sits inside the larger Environment and Ecology syllabus, which has quietly become one of the highest-scoring blocks in Prelims GS Paper I. Do not study hotspots as an isolated flashcard; study them as part of a connected map of India's conservation architecture — hotspots, protected areas, wetlands, biosphere reserves, and the species that live in them. Build the static base from your NCERT and one standard reference, then keep it warm with current affairs whenever the Western Ghats, a new species discovery in the North-East, or an island ecology story appears in the news. For the wider game plan, see our Environment & Ecology preparation strategy, and if your NCERT foundation needs work, start with how to read NCERT books for UPSC.

That is the whole topic, taught the way it should be. Four hotspots, two criteria, one island trap, and the discipline to connect it to the rest of your environment notes. Learn it once with genuine understanding rather than rote, and it becomes a mark you can count on — year after year, exam after exam.

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