Alluvial soil is found in districts like Thanjavur, Tiruvarur, Nagapattinam, Kanyakumari etc. Red soil is primarily found in Sivagangai and Ramanathapuram. Black soil is found in Coimbatore, Madhurai, Virudhanagar etc. and Laterite soil is found in parts of Kancheepuram, Tiruvallur and Thanjavur.