The region was known from ancient times for its volcanic nature and exceptionally hot springs.

Due to the volcanic nature of the islands, mineral deposits are abundant.

Paganel, who had already noticed this, called the attention of his friends to the volcanic nature of the mountain.

It is famed for its thermal baths due to the volcanic nature of the island.

The volcanic nature of the island has attracted scuba divers.

The lake water is not potable, and the volcanic nature of the soil makes it difficult to drill for water, he said.

The islands and rocks have a volcanic nature.

The volcanic nature of this enormous excavation was confirmed on all sides, and I pointed it out to my companions.

"It may become necessary because of the volcanic nature of the media coverage," he said.

In the particular case of the Azores, the risk is all the greater given the volcanic nature of the seabed.