The Hljˇaklettar Rock Formations means äEcho Rocksô literally translated into English and are the remains of an ancient row of craters, formed about eight to ten thousand years ago; they were once volcanic craters until a devastating flood about 2500 - 3000 years ago, washed away all the loose ground surrounding the craters, leaving behind only the solid rock formations and crater plugs. The flood is believed to have occurred due to a volcanic eruption beneath the icecap of Vatnaj÷kull. Some of the extraordinary rock formations are standing in the middle of J÷kulsß ß Fj÷llum glacial river. Hljˇaklettar are a part of the so called J÷kulsßrglj˙fur canyon, a 25 km long canyon of the glacial river J÷kulsß ß Fj÷llum. The name of this magnificent canyon means translated into English Glacial River Canyon. Further south and upstream in J÷kulsßrglj˙fur canyon are several extraordinary waterfalls, among them the most powerful waterfall in Iceland, Dettifoss. Hljˇaklettar are located at the entrance to Vesturdalur Valley by the river J÷kulsß ß Fj÷llum, the second longest river in Iceland that takes its source in Vatnaj÷kull Glacier, the largest glacier in Iceland. Hljˇaklettar or the Echo Rocks derives its name from the echo of the nearby turbulent glacial river, J÷kulsß ß Fj÷llum. There are several marked hiking routes through this magnificent area.
After a short hike from the parking lot in Hljˇaklettar you will reach a cluster of rocks in Hljˇaklettar, that are crater plugs with many caves and extraordinary formations of basalt columns. Many of the rock formations in Hljˇaklettar have names and each of them has been given their name for their look and formation. for example Kastalinn - the Castle, This formation features two large rocks which give it a fortress like appearance. Tr÷lli - the Troll, This rock formation is only a short distance from Kastali. It looks like a huge troll, guarding the castle. Kirkjan - the Church, is located about a hundred meters away from the Giant. Use your imagination and you will likely find a many interesting sculptures formed in the rocks. The GPS coordinates of Hljˇaklettar are 65.936076, -16.535615