Soil varieties of Tamil Nadu and the districts where they are found:

Kind of soil	Districts
Red Soil	All the districts
Black soil	Coimbatore, Tiruppur, Madurai, Dindigul, Virudhu Nagar, Tirunelveli, Thoothukudi,
Alluvial soil	Thanjavur, Nagappattinam, Trichy, Thiruvarur
Mountain Soil	Some areas of the Nilgiris
Soil of Mangrooves	Cuddalore, Rameswaram, Thoothukudi, (from Pichavarm to Muthuppettai)

The important river side cities of Tamil Nadu

City                        Rivers

Madurai                        Vaigai

Trichy                            Cauvery

Srirangam                      Kollidam, Cauvery

Tirunelvi                        Thamirabarani

Vellore                          Palar