Hljóðaklettar means rocks that echo  due to accoustic effects. It is located in North East Iceland. It is in Jökulsárgljúfur Canyon which is part of Vatnajökull National park. It is a collection of basalt of columnar rock formation with unique formation and a number of caves  at the entrance to Vesturdalur valley. The best way to get to Hljóðakletta is by road 862 which is a gravel road and only open during the summer. 4×4 WD cars are highly recommended. Close to Hlóðaklettar is a camping site and a few km from there a parking lot where two marked hiking trails start. One is a 1 km easy stroll which take about 30 minutes, but the other  is a more challenging circle estimated to take 2 hours to complete.

 GPS  65.935071, -16.538064