Luis' WoGE #433 seemed almost impossible at first glance, but there were enough clues to lead me to New Zealand even without noticing the deleted image information.
Sticking with an eruptive theme, I hereby present one that I suspect really IS hard:
A warning: If you activate shorelines, this one isn't marked - at least not in the correct place. The Wikipedia tag is in a third location.
For any new players to Where on (Google) Earth, simply post a comment
with latitude and longitude and write something about the
(geologic/geographic/hydrographic) feature in the picture. If you win,
you get to host the next one. Previous WoGEs are collected by Felix on his blog and a KML file.