Agaya Gangai, Waterfall in Namakkal district, India

Agaya Gangai is a waterfall that drops 91 meters from the Aiyaru river into a pool surrounded by dense forest and rocky terrain. The water plunges dramatically over layered rock faces and collects in a basin below, creating a natural amphitheater of stone and vegetation.

Agaya Gangai is formed by the Aiyaru river dropping about 300 feet (91 m) on the Kolli Hills, near the Arapaleeswarar temple. The Tamil Nadu tourism department built the 1196-step stairway down to the falls. The forest around the falls holds caves linked to the sages Bogar, Agastyar, Korakkar and Kalangi Nathar.

The name Agaya Gangai means "Ganges of sky", and the fall is also called Peraruvi, or Pei aruvi locally, for its heavy flow. It lies beside the Arapaleeswarar temple on the Kolli Hills, and the forest around it holds caves linked to the sages Bogar, Agastyar, Korakkar and Kalangi Nathar.

The waterfall is reached by a staircase of 1,196 steps built by the Tamil Nadu tourism department, descending steeply from near the Arapaleeswarar temple; shelters along the way serve as rest stops. The climb back up takes longer than the descent, so allow time for it. The Aiyaru river leaves the fall flowing east toward Puliyancholai in Tiruchirappalli district.

A dwarf gecko, a daytime, rock-dwelling insect-eater, is named after the falls and lives on the rocks around them. The forest near the water also holds caves linked to the sages Bogar, Agastyar, Korakkar and Kalangi Nathar.