Topography of India :
Three main geological regions:
Indo-Gangetic Plain and Himalayas, collectively known as North India; and Peninsula or South India. Ten physiological regions: Indo-Gangetic Plain, northern mountains of the Himalayas, Central Highlands, Deccan or Peninsular Plateau, East Coast (Coromandel Coast in south), West Coast (Konkan, Kankara, and Malabar coasts), Great Indian Desert (known as Thar Desert in Pakistan) and Rann of Kutch, valley of the Brahmaputra River in Assam, northeastern hill ranges surrounding Assam Valley, and islands of Arabian Sea and Bay of Bengal.