Udumalai, also known as Udumalaipettai or Udumalpet, is a town in Tirupur district in the southern Indian state of Tamil Nadu. It is the headquarters of Udumalaipettai taluk and as of 2011, the town had a population of 61,133. Udumalpet town is under Udumalpet Legislative Assembly constituency.
The municipality was established in 1918 and upgraded to a second-grade municipality in 1970. It was declared a first-grade municipality in 1979 and further upgrades to selection grade municipality in 1984. The extent of the municipality is 7.41 km2 of which 6.582 km2 is urban and 0.828 km2 is rural. The city was part of Coimbatore district until 2008 when it became part of the newly formed Tiruppur district, a change which was opposed by the residents.
Udumalai is surrounded by the Western Ghats on three sides. The average altitude of the town is 1208 feet above MSL. The topography is undulated and the general slope is from west to North. Black clay soil is the predominant soil of the area. The town gets major rainfall during the south-west monsoon period. The average annual rainfall is 501.40 mm. Black and red soil types are found in the town. The soil contains more of alumina and gypsum. While black soil area is utilized for agriculture, the areas with red soil have more urbanized uses.
Source: Wikipedia