The river Manimuthar is a major tributary of the Tamiraparani. It arises from the dense forest a top Senkutheri in Ambasamudram taluk at the height of about 1300 m. from MSL. The tributaries of the Manimuthar are the Keezha Manimuthar (lower or eastern Manimuthar) and the Varattar.

The river runs from its source for a distance of 9 km. and confluences with the Tamiraparani near Kallidaikurichi. In its 9km. course, it makes minor cataracts. The river contributes a lot, as tributary, to enhance the water level of Tamiraparani as it is always in full spate and perennial. In the year 1957, Manimuthar anaicut was built across the river just three km. above its confluence with Tamiraparani.
 
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