Kolli Malai / கொல்லி மலை
Kolli Hills or Kolli Malai is a small mountain range located in central Tamil Nadu and spreaded over the Namakkal district of India. The mountains rise to 1300m in height and cover an area of approximately 280 km².
Agaya Gangai (Tamil: ஆகாய கங்கை) waterfalls are located in Kolli Hills of the Eastern Ghats. Panchanathi, a jungle stream, cascades down as the Agaya Gangai (En:Ganges of Sky), near the Arapaleeswarar temple atop the Kolli Hills in Namakkal district, Tamil Nadu. It is a 300 feet (91 m) waterfall of the river Aiyaru situated close to Arapaleeswarar temple. It is located in a valley that is surrounded by mountains on all sides.
The caves of Korakka Siddhar and Kalaanginatha Siddhar are situated near the Agaya Gangai waterfalls inside the forest area.