Coimbatore, Madurai, Virudhunagar, Thoothukudi and Tirunelveli districts in Tamil Nadu have ___________.
The black clayey alluvium rich soil is known as black cotton soil is found in parts of Coimbatore, Madurai, Dindigul, Thoothukudi and Tirunelveli and in patches in the districts of Kancheepuram, Vellore, Salem, Dharmapuri, Ramanathapuram, Virudunagar and the Nilgiris.