East India is a region of India consisting of the Indian states of Bihar, Jharkhand, Odisha and West Bengal and also the union territory of the Andaman and Nicobar Islands. The region roughly corresponds to the historical region of Magadha from which it inherits its various Eastern Indo-Aryan languages. The states of Bihar and West Bengal lie on the Indo-Gangetic plain. Jharkhand is situated on the Chota Nagpur Plateau. Odisha lies on the Eastern Ghats and the Deccan Plateau. West Bengal's capital Kolkata is the largest city of this region. The Kolkata Metropolitan Area is the country's third largest. The region is bounded by Bhutan, Nepal and the state of Sikkim in the north, the states of Uttar Pradesh and Chhattisgarh on the west, the state of Andhra Pradesh in the south and the country of Bangladesh in the east. It is also bounded by the Bay of Bengal in the south-east. It is connected to the Seven Sister States of Northeast India by the narrow Siliguri Corridor in the north east of West Bengal. East India has the fourth-largest gross domestic product than any other region in India. The region was ruled by several empires, including Gangaridai, Nandas, Mauryans, Guptas, Palas, Senas, Eastern Gangas, Gajapatis, Delhi Sultanate, Bengal Sultanate, Mughal Empire and the British Empire. History During the Neolithic period, agriculture started in South Asia. Neolithic settlements have been found in Chirand. In the Kabra-Kala mound at the confluence of the Son and North Koel rivers in Palamu district, various antiquities and art objects from the Neolithic to medieval periods have been found; the pot-sherds of redware, black and red ware, black ware, black slipped ware, and NBP ware are from the Chalcolithic to late medieval periods. There are ancient cave paintings in Isko, Hazaribagh district, from the Meso-chalcolithic period (9,000–5,000 BCE). From Kuchai, near Baripada, various Neolithic tools like hoes, chisels, pounders, mace heads, grinding stones and also pieces of pottery. Prehistoric paintings and inscriptions have also been found in Garjan Dongar in Sundergarh district, and Ushakothi in Sambalpur district and Vimkramkhol in Jharsuguda district. There has been an uncertainty about the inscriptions at Ushakothi and Vimkramkhol regarding whether they are in a proto-Brahmi script. Yogimath near Khariar has cave paintings from the Neolithic. There is Chalcolithic sites in Pandu Rajar Dhibi in the lower Ajay valley in West Bengal. Iron slag, microliths, and potsherds from 1400 BCE,