The answer is the Himalayan, the Gangetic Plain, and the Deccan Plateau. The Himalayan range is bounded on the northwest by the Karakoram and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the Indo-Gangetic Plain. While, the Gangetic Plain is a 255 million hectare abundant plain surrounding utmost of northern and eastern India, the eastern portions of Pakistan, and nearly all of Bangladesh. The Deccan Plateau is a large plateau in southern India. It upsurges to 100 meters in the north, and to more than 1 kilometer in the south, forming an elevated triangle within the downward-pointing triangle of the Indian subcontinent's shoreline.