Ketti, also called Ketti Valley, is a small town nestled in a large valley of the same name. It is located in The Nilgiris District of Tamil Nadu Sta…Ketti, also called Ketti Valley, is a small town nestled in a large valley of the same name. It is located in The Nilgiris District of Tamil Nadu State, South India and is a Revenue Village of Coonoor Taluk. Upper Ketti is another village called Yellanahalli, which is located on the main Coonoor to Ooty road.