Coimbatore District is one of the districts of the state of Tamil Nadu in India. It is located in the western part of the state in the Kongu Nadu region. Coimbatore is known as the "Manchester of South India" and is one of the industrialized towns of Tamil Nadu. The region is bounded by Palghat district of Kerala on the west and by Idukki district of Kerala in the South. Coimbatore shares its borders with Tirupur in the East and Nilgiris in the North. A small portion of Erode district shares the border near Puliampatti in the North East. The headquarters of the district is Coimbatore city.