Ernakulam District is a district of the state of Kerala in southern India. The district includes the largest metropolitan region of the state Greater Cochin. Ernakulam District is the highest revenue yielding district in the state and is called and known as the commercial capital of Kerala. It is the third most populous district in Kerala,after Malappuram and Thiruvananthapuram (out of 1Ernakulam district also hosts the highest number of international and domestic tourists in Kerala state. It is surrounded by Thrissur District to the north, Idukki District and Tamil Nadu State to the east, Alappuzha and Kottayam districts to the south and Arabian sea to west. Its headquarters is located at Kakkanad, a suburb of Kochi city. The language people speak in Ernakulam is Malayalam which is the mother-tongue of the State of Kerala. English is widely used in business circles. Ernakulam became India's first 'fully literate district' in 1990 and the country's first district having 100 percent banking.