Kolli Hills or Kolli Malai (Tamil: கொல்லி மலை) is a small mountain range located in central Tamil Nadu in Namakkal district of India. The mountains are about 1000 to 1300 m in height and cover an area of approximately 280 km². The Kolli Hills has 70 hair pin bends to reach the top of the hills. The Kolli Hills are part of the Eastern Ghats, which is a mountain range that runs mostly parallel to the east coast of South India. The mountains are relatively untouched by commercial tourism and still retain their natural beauty.
Two viewpoints - one at Seekuparai and another at Selur Nadu - are being developed to encourage tourism. As of 2007, creation of a park and formation of an approach road to the Seekuparai viewpoint were nearing completion.The government maintains a pineapple research farm where hybrid varieties are created. Research about medicinal plants is also pursued on these mountains.The government holds a tourism festival in August.
Kolli Hills has been the top choice for nature lovers, hiking enthusiasts, trekking clubs and meditation practitioners among hill stations in Tamil Nadu. In comparison to other hill stations in Tamil Nadu, Kolli Hills is not commercialized, less polluted and offers unique mountain ranges. The district administration has recently developed a botanical garden, Boat house, Cave house, New waterfalls called Masila Falls. The administration also celebrated "Ori festival" with lot of cultural events.
