Patna /ˈpʌtnə/ is the capital of the Indian state of Bihar, its most populous city and the second most populous city in Eastern India after Kolkata. It is the administrative, industrial and educational centre of the state. Patna is one of the oldest continuously inhabited places in the world. Ancient Patna, known as Pataliputra, was the capital of the Magadha Empire under the Haryanka, Nanda, Mauryan, Sunga, Gupta and Pala.Pataliputra was a seat of learning and fine arts. Its population during the Maurya period was about 400,000.The modern city of Patna is situated on the southern bank of the Ganges. The city also straddles the rivers Sone, Gandak and Punpun. The city is approximately 35 km long and 16 km to 18 km wide.In June 2009, the World Bank ranked Patna second in India for ease of starting a business. As of 2010-2011, Patna had the highest per capita gross district domestic product in Bihar, at 57,843. Using figures for assumed average annual growth, Patna is the 21st fastest growing city in the world and 5th fastest growing city in India by the City Mayors' Foundation. Patna registered an average annual growth of 3.72% during 2006-2010.The Buddhist, Hindu, and Jain pilgrim centres of Vaishali, Rajgir, Nalanda, Gaya, Bodhgaya, and Pawapuri are nearby and Patna is also a sacred city for Sikhs as the last Sikh Guru, Guru Gobind Singh, was born here.