Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Natural Arch, Tirumala hills is a distinctive geological wonder located 1 km (0.6 mi) North of the Tirumala hills temple, near the Chakra Teertham in the state of Andhra Pradesh, India. The Arch is also called Silathoranam in local language (Telugu language: Sila means rock and thoranam means a garland strung over a threshold, connecting two vertical columns or an arch as in this case). The arch measures 8 m (26.2 ft) in width and 3 m (9.8 ft) in height, and is naturally formed in the quartzites of Cuddapah Supergroup of Middle to Upper Proterozoic (1600 to 570 Ma) due to natural erosive forces.