In Journey to the Center of the Earth, what island did they resurface on?

This
is a fairly common question concerning this book, and often readers and educators misinterpret
the geography of the text. A common misconception is that the explorers in the story emerge from
Etna. That is incorrect. The question posted here correctly asks what island
the explorers emerge from. Mount Etna is technically an island volcano. It is
located on the island of Sicily which is just barely southwest of mainland Italy; however, the
explorers from this Verne story emerge through the vent of a volcano on a much smaller island.
The explorers come out of...