Kallar originates in the forests of Ranni reserve in the eastern part of Pathanamthitta district.

It flows its entire length through rich forests before merging with Pamba at Vadasserikkara.

Small villages such as Thannithode, Thekkuthode and Manneera are the major human settlements along the banks of this river.

Kallar is the main component of Adavi eco-tourism project at Mannera in the Konni forest division where it offers an opportunity for coracle riding along a three kilometer stretch.

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