Ambae (Aoba) Island

Information about Ambae can be read here. The volcano most recently erupted in December 2005.
The first image is like the 'frying pan lake' described in Stargate SG-1 City of the Gods.

Ambae or Aoba volcano 1995 (Photo: Royal New Zealand Air Force) Manaro Lake (not active) Voui Lake (active)

Note the white froth on the by then very acidic Lake Voui

Photo: Michel Lardy. The above image shows what were once highly vegetated islands in the acid lake.