Kongu Nadu used to consists of the present day regions of districts of Coimbatore, Tirupur, Erode, Salem, The Nilgiris, Karur, Dharmapuri, Namakkal, Krishnagiri and parts of Dindigul district in the South Indian state of Tamil Nadu. Parts of Palakkad District in the state of Kerala and parts of Chamarajanagar District in the state of Karnataka also fall under the region. The Western Ghats mountain range passes through the region with major rivers Kaveri, Bhavani, Amaravati and Noyyal flowing through the region. Palghat Gap, a mountain pass connects the neighbouring state of Kerala to the region. The Eastern Ghats mountain range, which consists of the hills Kollimalai of Namakkal district, Shevaroy (Shervarayan) and Mettur Hills of Salem district and Palamalai of Coimbatore district, also passes through the region. The Biligiriranga Hills of Chamarajanagar District is located at the confluence of Eastern and Western Ghats belongs to the region. The Kaveri river flows into Tamil Nadu from Karnataka through Dharmapuri, Salem, Erode, Namakkal and Karur districts.