On the picture is Grabokafell, one of three volcano craters in the Grabrok area.
These craters are about 3000 years old, and consist mostly of loose gravel of pumice.
The picture is taken from the largest of the three craters. The scribble in the gray
in the crater is someone having made his signature with his feet in the moss.
While it is easy to understand why he did so, the damage to the moss from him
and others is almost irrepairable.