Central Crater, Tongariro, Ngauruhoe. The floor of "Central Crater", in the foreground, is actually a weathered ash and lava filled old drainage basin rather than a true crater. Note the poles marking the track from Red Crater - if the weather turns bad never lose sight of the track (and carry a compass and map and know how to use them).
More images at http://www.flickr.com/photos/digitaltrails
