 The Ridge is estimated to be 170 million years old.It is located just outside the north-eastern part of Kuala Lumpur, stretching from Taman Seri Gombak to Kampung Kemensah.The Klang Gates Dam was built at a small natural opening (gap) separating the two main stretches of the Ridge, namely Bukit Batu Tabor in the west and Bukit Chondong in the east.