Mumbai is the most populous city in India with a total population of 12,442,373. Highest employment in the Mumbai district is in Agriculture, Cotton Textile, Wool, Silk, Readymade Garments, Rubber, Plastic, Metal, Transport equipment and other household industries. The district has 1% of the workforce employed in the Agricultural Sector, 96% in the Industrial Sector and the remaining 3% are Household workers. Mumbai lies at the mouth of the Ulhas River on the western coast of India, in the coastal region known as the Konkan. It sits on Salsette Island, partially shared with the Thane district. Mumbai is bounded by the Arabian Sea to the west. Many parts of the city lie just above sea level, with elevations ranging from 10 m to 15 m. The main food crops are Mangoes, Grapes, Bananas, Oranges, Wheat, Rice, Jowar, Bajra, and Pulses. Cash crops include Groundnut, Cotton, Sugarcane, Turmeric, and Tobacco. The name Mumbai is derived from Mumbā or Mahā-Ambā—the name of the patron goddess (Kuladevata) Mumbadevi of the native Agri, Koli and Somvanshi communities—and ai meaning "mother" in the Marathi language, which is the mother tongue of the Koli people and the official language of Maharashtra. Mumbai is built on what was once an archipelago of seven islands: Isle of Bombay, Parel, Mazagaon, Mahim, Colaba, Worli, and Old Womans Island (also known as Little Colaba). It is not exactly known when these islands were first inhabited. Pleistocene sediments found along the coastal areas around Kandivali in northern Mumbai suggest that the islands were inhabited since the South Asian Stone Age.