Bhavani Sagar Dam in Sathyamangalam, which is around 85 KM from Coimbatore is a huge dam constructed across the river Bhavani. To go from Coimbatore, one could take a bus from Coimbatore to Sathyamangalam but get down in Puliyampettai, and take a town bus from there to Bhavani Sagar Dam. If someone is coming from Karnataka, they could come to Sathyamangalam, and take a town bus to the dam from there, as well.