
1) Ephemeral island 2) Volcano of Vanuatu
Found on
https://www.crosswordclues.com/clue/kuwae

The submarine volcano Karua, one of the most active volcanoes of Vanuatu, is near the northern rim of Kuwae Caldera. == Eruptive history == Tongoa and Epi islands once formed part of a larger island called Kuwae. Local folklore tells of a cataclysmic eruption that split this island into two smaller islands with an oval 12 x 6 km caldera in between...
Found on
http://en.wikipedia.org/wiki/Kuwae
No exact match found.