Nagpur is the 13th most populous city in India with a total population of 24,05,665. Highest employment in the Nagpur district is in Agriculture, Steel, Minerals, Cotton and other household industries. The district has 34% of the workforce employed in the Agricultural Sector, 63% in the Industrial Sector and the remaining 3% are Household workers. The major exportable items are Steel Bar, Rice, Manganese Oxide, Spun Yarn, Aluminium Sheet, Castings, Steel Forging, Dal, Mango Puree and others. The major crops produced in the district are Soybean, Cotton, Paddy, Pigeon Pea, Jowar, Groundnut, Moong, Urd, Sugarcane, Nagpur Mandarin, Mango, Acid Lime, Brinjal, Tomato, Onion etc. The river Nag flows through Nagpur. B. R. Ambedkar claimed that both the city and the river are named after "Nag people". The word "pur" means "city" in many Indian languages. During British rule, the name of the city was spelled and pronounced as "Nagpore". In the 18th century, this city was created by the leader of Gond Dynasty named Bakht Buland Shah in the first half of the century. Human existence around present-day Nagpur can be traced back 3000 years to the 8th century BCE. Mehir burial sites at Drugdhamna (near the Mhada colony) indicate that the megalithic culture existed around Nagpur and is still followed.