Kolli Hills or Kolli Malai is a small mountain range which is part of the Eastern Ghats in the Namakkal district. Also famous for the Arapaleeswarar temple where the legend goes that the Linga got hurt with the plough of a farmer and it is evident from the wounds on the linga. It is believed that there is a secret route from Arapaleeswarar to Rasipuram which is another Shiva temple. Kolli hills are also famous for the water falls that simply awes one and all.
Elevated to an altitude of 1000 to 1300 m above sea level is a famous hillock in Eastern Ghats between Namakkal and Tirchy. Kolli Malai is much pristine location where the temperature never goes beyond 30 degree Celsius and never falls below 13 degree Celsius. This salutary climate makes Kolli Malai much famed tourist destination which can be visited throughout the year. Local Deity who guards the Kolli Malai is called as “Kolli Paavai”. The hillock was ruled by a King named Valvil Ori. This king was renowned for his brave and marksmanship as he killed a lion, bear, deer and a boar in a single arrow shoot from his bow.
Tourists can be enthralled to descend 1000 steps amidst of thick jungle to reach the Agayagangai Water falls. This waterfalls cascade from an altitude of 300 feet and it is perfect to take bath in it. Arappaleswarar Temple dedicated to Lord Shiva is situated on the spot where the steps to climb down for Agayagangai Waterfalls starts. There is a well maintained Boathouse where tourists can go for boating and relax on the park established in the nature Island in the center of the Lake. Beside these spots, tourists can also look out for Siddhar caves, Sekkuparai and Selur View Points in Kolli Malai.