North India is a geographical region, loosely defined as a cultural region comprising the northern part of India wherein Indo-Aryans form the prominent majority population, while Tibeto-Burmans form the significant minority population. It extends from the Himalayan mountain range in the north to the Indo-Gangetic Plain, the Thar Desert, till Central Highlands. It occupies nearly two-quarters of the area and population of India and includes one of the three mega cities of India: Delhi. In a more specific and administrative sense, North India can also be used to denote the northern Indo-Gangetic Plain within this broader expanse, to the Thar Desert.