Chachai Falls, Waterfall system in Rewa District, India

Chachai Falls is a waterfall on the Bihad River, a tributary of the Tamsa (Tons) River, in Rewa district, Madhya Pradesh. It drops 130 metres (430 ft) in a single plunge at a nick point on the edge of the Chitrakoot Hills, part of the Kaimur Range, making it India's 23rd highest waterfall.

The falls are a nick point: a break in the Bihad River's gradient produced by rejuvenation, where the river drops 130 metres (430 ft) as it leaves the Rewa Plateau. The Bihad is a tributary of the Tamsa or Tons River, and the falls lie at the edge of the Chitrakoot Hills in the Kaimur Range.

The falls lie at the edge of the Chitrakoot Hills, part of the Kaimur Range, and are reached from Semaria, about 10 km away, or from Rewa and Satna. The Bihad River drops 130 m here, making it India's 23rd highest waterfall, a landmark for the Rewa district villages around Chachai.

The best time to visit is between August and February when water flow is most robust after seasonal rains. The trek involves walking through forested terrain, so wear sturdy shoes and bring water for the journey.

At the location of the falls, the Bihad River reaches a sudden break where it drops steeply, a rare geological feature known as a nick point. This kind of rupture in the river's slope usually develops where rock layers resist erosion differently.