Northern India is a loosely defined region consisting of the northern part of India. The dominant geographical features of North India are the Indus-Gangetic Plain and the Himalayas, which demarcate the region from the Tibetan Plateau and Central Asia.
East India is a region of India consisting of the Indian states of Bihar, Jharkhand, West Bengal, Odisha and also the union territory Andaman and Nicobar Islands. West Bengal's capital Kolkata is the largest city of this region. The Kolkata Metropolitan Area is the country's third largest.
Northeast India is the easternmost region of India representing both a geographic and political administrative division of the country. It comprises eight states – Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim and Tripura.
Western India is a loosely defined region of India consisting of its western part. The Ministry of Home Affairs in its Western Zonal Council Administrative division includes the states of Goa, Gujarat, and Maharashtra along with the Union territory of Daman and Diu and Dadra and Nagar Haveli while the Ministry of Culture and some historians also include the state of Rajasthan.
South India is the area including the Indian states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and Telangana as well as the union territories of Lakshadweep, Andaman and Nicobar Islands, and Puducherry, occupying 19% of India's area.
Central India is a loosely defined region of India consisting of the states of Chhattisgarh and Madhya Pradesh. Indore, the commercial capital of Madhya Pradesh is the largest city in the region. Other major cities include Bhopal and Raipur.