The Aravalli Range is considered the oldest mountain range in India. This range stretches across the northwestern part of the Indian subcontinent, covering the states of Gujarat, Rajasthan, Haryana, and Delhi. The Aravalli Range is geologically significant and dates back to the Proterozoic era, making it one of the oldest mountain systems in the world. Over time, weathering and erosion have reduced the height of these mountains, but they still play a crucial role in shaping the landscape of the region.