 It is bordered to the north by Nemmara Forest Division, to the south by Vazhachal Forest Division and the west by Chalakudy Forest Division.The sanctuary has a hornblende, biotite, gneiss and charnockite geology.Altitude ranges between 300 m and 1438 m. There is a 600 m elevation opening through the Nelliampathy hills from Anamalai hills on the northern boundary of the sanctuary at Thoothampara.