Attappadi is an extensive mountain valley at the headwaters of the Bhavani River nestled below the Nilgiri Hills of the Western Ghats. It is bordered to the east by Coimbatore district in Tamil Nadu, on the north by the Nilgiris, south by the Palghat taluk and on the west by Karimba-I and II, Pottassery-I and II, and Mannarghat revenue villages of Mannarghat taluk of the Palghat District and Ernad taluk of the Malappuram district.

The 249 km² Attappadi Reserve Forest is an informal buffer zone bordering the Silent Valley National Park to the West.[3] 81 km² of this forest was separated to become most of the new 94 km² Bhavani Forest Range which is part of the 147.22 km² Silent Valley Buffer Zone formally approved by the Kerala Cabinet on 6 June 2007. The Cabinet also sanctioned 35 staff to protect the area and two new forest stations in Bhavani range at Anavai and Thudukki. The zone is aimed at checking the illicit cultivation of ganja, poaching and illicit brewing in areas adjacent to Silent Valley and help long-term sustainability of the protected area.

The elevation of Attappati valley ranges from 750 meters (2,460 ft) to the Malleswaran peak at 11°6′32″N 76°33′8″E which rises to 1,664 meters (5,459 ft) from the center of the valley. The Bhavani River flows from the Northwest around the mountain in a tight bend past Attappadi village and continues to the Southeast.