The one which is seen in the picture is a wonderful arch in front of the Akka Mahadevi Caves. It is nearly 200 ft long and a strong monolithic one and this speaks of the age of the Cave. I draw attention of the reader to similar such arches in Tirumala Hills which were confirmed to have of age over 150 million years or so by the Geologists. The arches in Tirumala Hills are called as Sila Toranams. This particular arch in Akka Mahadevi Cave is perhaps greater than the one on Tirumala Hills.