Lava stream just under the surface of Iceland's Eyjafjallajokull volcano
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Ash-covered lava fields on slopes of Icelandic volcano

22 August 2010 Last updated at 06:55 BST

It is four months since the eruption of Iceland's Eyjafjallajokull volcano, which played havoc with flights and travel plans across Europe and beyond.

Now, hikers are once again walking on the slopes of the crater, where they are discovering some dramatic changes to the landscape - even new 'mountains' created by the eruption.

While metres of ash cover the ground, obscuring glaciers and other features, streams of lava can be seen flowing just below the surface.

Mountain guide Arsaell Hauksson gave BBC News a tour of this amazing landscape.