The Pachaimalai Hills, also known as the Pachais, are low mountain range in the Eastern Ghats System. They are located in Tiruchirapalli district of Tamil Nadu state, southeastern India. It is situated at a distance of 73 km from Trichy and 112 km from Salem. In the Tamil language, Pachai means green. With rivers Sweata Nadi and Kallar flowing through, these hills offer waterfalls, trekking trails and medicinal gardens. It has recently developed as a region.