Kolli Hills a small mountain range located in central Tamil Nadu in India. The mountains are about 1000 to 1300 m in height and cover an area of approximately 280 km². 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 tourism and still retain their natural beauty. They were sometimes known as “Kolli Moloi”, the “Mountains of Death”, due to the many diseases there such as malaria.
The mountain is a site of pilgrimage, because of the Arapaleeswarar temple, which is believed to have a secret path to the Shiva temple in Rasipuram. The Shiva temple is said to have been built by Valvil Ori in the 1st or 2nd century when he ruled this area.
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, and mountains can be reached by road easily from Trichy (80 km) or Namakkal (50 km) or Salem (100 km) or Rasipuram(35 km).