The area is the relic of an ancient volcano (Vulsinio).

The third largest lake in the Philippines used to be the caldera of an ancient volcano.

This hill is the collapsed caldera of an ancient volcano that was believed to be active 440 million years ago.

Beyond that were great crags and the cone shapes of ancient volcanoes.

They're the remnant of an ancient volcano 15 miles long, 5 miles across and 8,000 feet high.

The bay itself is the flooded crater of an ancient volcano.

The breath of ancient volcanoes had charred the very desert.

This beautiful but treacherous piece of land includes an ancient volcano.

Relax in hot springs powered by an ancient volcano.

It is also unique because of its black sand, caused by the iron content derived from the ancient volcanoes in the area.