There are no limestones or volcanic springs in the catchment.

The town is known for its greenhouses, which are heated by hot water from volcanic hot springs.

It reminded her of the gloopy mud of a volcanic hot spring.

That would only make sense, particularly with the volcanic springs two klicks east of them.

For now a hot volcanic spring will suffice.

It comes from a volcanic spring in the Carpathian Mountains of Romania.

The hippos of Mzima, by contrast, have a guaranteed year-round water supply thanks to the natural volcanic spring.

The great opportunity of his career came in 1977 with the discovery of the hot volcanic springs on the deep seabed.

At the reef, volcanic hot springs along the ocean floor send up streams of tiny wobbling bubbles.

Famous for its volcanic springs, this picturesque town is the single most popular destination in Ecuador among backpackers.