The following is a list of the prominent caves formed in the islands of the Azores:

Corvo

Faial

Flores

Graciosa

The entranceway to the Furna da Maria Encantada

Pico

Lavacicles on the roof of one of the Gruta das Torres lava tubes

Santa Maria

São Jorge

The Furna do Poio, due to its closeness to the sea, resulted in the seepage of water forming a subterranean pond.

São Miguel

Terceira

A view of the Algar do Carvão, accessible from the nature centre in Posto Santo
A passage within the Gruta do Natal system, carved from lava flows

References