Delhi Ridge, sometimes simply called The Ridge, is a ridge in the National Capital Territory of Delhi in India. The ridge is a northern extension of the ancient Aravalli Range, some 1500 million years old (compared to just 50 million for the Himalaya). The ridge consists of quartzite rocks and extends from the Southeast at Tughlaqabad, near the Bhatti mines, branching out in places and tapering off in the north near Wazirabad on the west bank of the river Yamuna, covering a distance of about 35 kilometers.