sandalwood, rosewood and bamboo. The Nilgiris slope of the Mettupalayam range is rich in sandalwood trees and bamboo. They vary from rich tropical evergreen forests of Punachi range to jungles of shrubs in southern ranges. Apart from the high altitude regions of Western Ghats, most of the forest area has come under Lantana invasion. The locals refer to it as Siriki Chedi. The district borders Palakkad district of Kerala in the west, Nilgiris district in the north, Erode district in the northeast and east, Idukki district of Kerala in the south and Dindigul district in the southeast. The district has an area of 7,649 square kilometers. The southwestern and northern parts are hilly, part of the Western Ghats, and enjoys pleasant climate all throughout the year. To the west is the Palghat Gap, the only major pass in the long stretch of the ghats abutting Tamil Nadu and Kerala. The Palghat Gap, connecting Coimbatore city and Palakkad city, serves as an important transit link for both the states. The rest of the district lies in the rain shadow region of the Western Ghats and experiences salubrious climate most parts of the year. The mean maximum and minimum temperatures for Coimbatore city during summer and winter vary between 35 °C to 18 °C. The average annual rainfall in the plains is around 700 mm with the northeast and the southwest monsoons contributing to 47% and 28% respectively to the total rainfall. The major rivers flowing through the district are Bhavani, Noyyal, Amaravathi, Kousika River and Aliyar. The Siruvani dam is the main source of drinking water for Coimbatore city and is known for its tasty water. Waterfalls in Coimbatore District include Chinnakallar Falls, Monkey Falls, Sengupathi Falls, Siruvani Waterfalls, Thirumoorthy Falls and Vaideki Falls. Demographics According to 2011 census, Coimbatore district had a population of 3,458,045 with a sex-ratio of 1,000 females for every 1,000 males, much above the national average of 929. 75.73% of the population lived in urban areas. A total of 319,332 were under the age of six, constituting 163,230 males and 156,102 females. Scheduled Castes and Scheduled Tribes accounted for 15.5% and 0.82% of the population respectively. The average literacy of the district was 83.98%. The district had a total of 958,035 households. There were a total of 1,567,950 workers: 75,411 cultivators, 201,351 main agricultural laborers, 44,582 in house hold industries, 1,121,908 other workers, 124,698 marginal workers,