Tiruchirappalli district lies almost at the exact centre of Tamil Nadu. The district has an area of 4,404 square kilometres. It is bounded in the north by
Salem district, Northwest by
Namakkal district, in the Northeast by
Perambalur District, East by
Ariyalur district and
Thanjavur District, in the southeast by
Pudukkottai district and
Sivagangai district, in the south by
Madurai district, in the southwest by
Dindigul district and, in the west by
Karur district. The district shares its borders with 10 other districts, the highest for any district in the state. The
Kaveri river flows through the length of the district and is the principal source of irrigation and drinking water.
Kolli Hills form the boundary of Tiruchirapalli and
Namakkal districts and
Pachaimalai Hills form the Boundary of
Salem and
Perambalur district with Tiruchirapalli district in the North and North East. The North most and South most parts of the district are hilly, central part of the district is
Kaveri plains. Trichy district is diverse in landscape, mixture of Fertile, Delta, Valleys, Hilly areas, Semi Arid Zones. Central part of the district is fertile due to river
Kaveri flowing through this district, by splitting the district into North and South. North Central and South Central part of the district is Semi arid and drought prone area, receives less rainfall. Evergreen
Pachaimalai Hills and
Kolli Hills form the Stunning and Enchanting Valley in between these two hills. Falls and Streams from these two hills fills up the lakes in valley areas and makes the land irrigated and Fertile.
Pachaimalai Hills receives high rain fall than average during both
Northeast Monsoon as well as
Southwest Monsoon, which makes these hills Greener throughout the year and gives a cool climate. ==Demographics==