Hjóðaklettar (Echo Rocks) in Jökulsárgljúfur in the Northern Region in Iceland are part of vast Vatnajökull National Park. The Rocks area distinctive cluster of columnar rock formations, unique even in Iceland. The columns lie at all angles thus reverberating sound with stunning clarity. Apart from the rock formations in Hljóðaklettar, you will find a labyrinth of caves and rock castles. You will also be amazed to see columnar basalt and basalt rosettes. Lava rosettes are developed when the lava stream forming the columns cools from all sides simultaneously. They are quite impressive.
When hiking the area, you will see columnar basalt everywhere. Further, Hljóðaklettar is possibly the only place in Iceland you will find vivid honeycomb weathering. There is a well-marked hiking trail through the area. To most people, clockwise is the right way to approach everything. In this instance, though, you should go anti-clockwise as it will give you more impressive views of the wonders of Hljóðaklettar, especially the "Church" and the "Troll." Much as your eyes will enjoy Hljóðaklettar, it is the shouting will do it for you. You'll find your voice doesn't just echo in waves into silence. It will reverberate from all directions, travel from one rock wall to another, reverberating over and over again, like a sonorous cobweb. It says a lot about nature's musical flair.
Below is the location of Ásbyrgi on the map of Iceland