<P> The Ganga is the longest river originating in India . The Ganga--Brahmaputra system occupies most of northern, central, and eastern India, while the Deccan Plateau occupies most of southern India . Kanchanjhunga, in the Indian state of Sikkim, is the highest point in India at 8,586 m (28,169 ft) and the world's 3rd highest peak . Climate across India ranges from equatorial in the far south, to alpine and tundra in the upper reaches of the Himalayas . the geographic view of India is pretty expository and vivid in the terms of area, mountains and relief . </P> <P> India is situated entirely on the Indian Plate, a major tectonic plate that was formed when it split off from the ancient continent Gondwanaland (ancient landmass, consisting of the southern part of the supercontinent of Pangea). The Indo - Australian plate is subdivided into the Indian and Australian plates . About 90 million years ago, during the late Cretaceous Period, the Indian Plate began moving north at about 15 cm / year (6 in / yr). About 50 to 55 million years ago, in the Eocene Epoch of the Cenozoic Era, the plate collided with Asia after covering a distance of 2,000 to 3,000 km (1,243 to 1,864 mi), having moved faster than any other known plate . In 2007, German geologists determined that the Indian Plate was able to move so quickly because it is only half as thick as the other plates which formerly constituted Gondwanaland . The collision with the Eurasian Plate along the modern border between India and Nepal formed the orogenic belt that created the Tibetan Plateau and the Himalayas . As of 2009, the Indian Plate is moving northeast at 5 cm / yr (2 in / yr), while the Eurasian Plate is moving north at only 2 cm / yr (0.8 in / yr). India is thus referred to as the "fastest continent". This is causing the Eurasian Plate to deform, and the Indian Plate to compress at a rate of 4 cm / yr (1.6 in / yr). </P> <P> India is divided into 29 states (further subdivided into districts) and 6 union territories and 1 National capital territory (I.e., Delhi). </P> <P> India's borders run a total length of 15,106.70 km (9,386.87 mi). </P>

Which is the oldest part of the indian landmass