Key Points

For discussion, India is often divided into five main geographical zones: the great mountain zone, the plains of the Ganga and Indus, the desert region, the southern peninsula, and the islands.

The Himalayas act as a natural barrier in the north. This massive range stretches about $2500 \\text{ km}$ and is the source of major rivers like the Ganga, Indus, and Brahmaputra.

The Himalayas were formed around 50 million years ago when the Indian landmass, which broke away from Gondwana, collided with the Eurasian landmass, causing the land between them to crumple and rise.

The Himalayas consist of three main ranges: the Himadri (Greater Himalayas), the highest and snow-covered; the Himachal (Lesser Himalayas), with hill stations; and the Shivalik (Outer Himalayas), the lowest foothills.

Located in the Himalayas, Ladakh is a cold desert with winter temperatures dropping below $-30^{\circ} \\text{C}$. It has a rugged, moon-like landscape and very little rainfall.

South of the Himalayas lie the vast Gangetic Plains, made fertile by minerals deposited by the Ganga, Indus, and Brahmaputra river systems. This region supports a large portion of India's population due to its suitability for agriculture.

The Thar Desert is a large arid region in western India, primarily in Rajasthan. It is characterized by vast sand dunes, extreme temperatures, and scarce water resources.

The Aravalli Hills are one of the oldest mountain ranges in the world. They act as a natural barrier, preventing the eastward expansion of the Thar Desert.

The southern part of India is a peninsular plateau, a large triangular landmass surrounded by water on three sides. It is bordered by the Western Ghats and the Eastern Ghats.

The Western Ghats are a continuous range of tall mountains along the western coast. The Eastern Ghats are a broken range of lower hills along the eastern coast.

Major rivers like Godavari, Krishna, and Kaveri flow from west to east into the Bay of Bengal. The Narmada and Tapti are major west-flowing rivers that drain into the Arabian Sea.

India has a long coastline of over $7500 \\text{ km}$. The West Coast is narrow and features estuaries, while the East Coast is wider and is known for its large river deltas.

India has two main island groups: the Lakshadweep Islands in the Arabian Sea, which are coral islands, and the Andaman and Nicobar Islands in the Bay of Bengal, which are volcanic islands.

The Sundarbans, located in the delta of the Ganga and Brahmaputra rivers, is the largest mangrove forest in the world. It is a UNESCO World Heritage Site and home to the Royal Bengal Tiger.

The northeastern part of India includes hills like the Garo, Khasi, and Jaintia. This region receives some of the highest rainfall in the world, resulting in lush forests and rich biodiversity.