Pakkamalai is a mountain and forest reserve in Villupuram district of Tamil Nadu, located 45 km southwest of Gingee.
There is a shrine to the Goddess Durga on one of the peaks, and a temple to Perumal (Vishnu) at mid-elevation.
Typical dry evergreen species in the forests include Atalantia monophylla, Acacia intsia, Combretum albidum, Dichrostachys cinerea, and Psydrax dicoccos, and typical dry deciduous species include Cochlospermum religiosum, Deccania pubescens, Garuga pinnata, Hildegardia populifolia, Ochna lanceolata, and Premna tomentosa.
[5][6] Hubera senjiana, a rare species of tree, is found only on Pakkamalai, growing in dry rocky soils along forest fringes between 200–300 metres elevation in association with Phyllanthus polyphyllus, Stenosiphonium russellianum, and Justicia beddomei.
[8] Pakkamalai is home to the easternmost population of the grizzled giant squirrel (Ratufa macroura).