Bhopal, is the capital city of the Indian state of Madhya Pradesh and the administrative headquarters of both Bhopal district and Bhopal division. It is known as the City of Lakes, due to presence of various natural and artificial lakes near the city boundary. It is also one of the greenest cities in India. It is the 16th largest city in India and 131st in the world. After the formation of Madhya Pradesh, Bhopal was part of the Sehore district. It was bifurcated in 1972 and a new district, Bhopal, was formed. Flourishing around 1707, the city was the capital of the former Bhopal State, a princely state of the British ruled by the Nawabs of Bhopal until India's independence in 1947. India achieved independence on 15 August 1947. Bhopal was one of the last states to sign the ‘Instrument of Accession’. The ruler of Bhopal acceded to the Indian government, and Bhopal became an Indian state on 1 May 1949. Sindhi refugees from Pakistan were accommodated in Bairagarh, a western suburb of Bhopal.