North of the Kaveri River are the higher Kollimalai, Pachaimalai, Shevaroy (Servarayan), Kalrayan Hills, Chitteri, Javadhu Hills, Palamalai and Mettur Hills in northern Tamil Nadu state. The climate of the higher hill ranges is generally cooler and wetter than the surrounding plains, and the hills are home to coffee plantations and enclaves of dry forest.