Dharavi is a slum and administrative ward, over parts of Sion, Bandra, Kurla and Kalina suburbs of Mumbai, India. It is sandwiched between Mahim in the west and Sion in the east, and spread over an area of 175 hectares, or 0.67 square miles (1.7 km²). In 1986, the population was estimated at 530,225 but modern Dharavi has a population of between 600,000 and over 1 million people. Dharavi is one of the largest slums in the world. It used to be the largest slum in Mumbai at one time, but as of 2011, there are four slums in Mumbai larger than Dharavi. Dharavi is situated between Mumbai’s two main suburban railway lines, the Western and Central Railways. The document also details the issues, redevelopment plans, and guided tours offered through the industrial and the residential part of Dharavi.