The crater Furna do Inshofri is located in the south-eastern part of the island of Graciosa. Graciosa Island - the northernmost island of the central group of the Azores, and also one of the nine inhabited islands of the Azores archipelago. Due to the fact that the island has a wavy terrain, low hills and small volcanic caves, the island of Graciosa is often called "elegant." It is worth noting that the island has been declared a UNESCO Biosphere Reserve.

The crater Furna do Inshofri a lava cave of impressive size and makes a striking impression. Summary of the crater has a dome shape. The crater Furna do Inshofri also called "Sulphur Grotto" due to the fact that there is a lot of sulfur and hot springs. In addition, there is a lake in the cold sulfur water. The diameter of the lake is 130 meters, and the depth - 15 meters.

The crater Furna do Inshofri crater Furna da Maria Encantada are part of the geological formation of the Caldeira da Graciosa, which is a distinctive feature of the landscape of the island. The length of the crater Furna do Inshofri is 197 meters, height - 80 meters, width - 172 meters. The path into the crater Furna do Inshofri is through the tower, whose height is 37 meters, after the need to go down the spiral staircase, which has 183 steps.

In the XIX century the cave was carefully investigated. In "sulfuric cave" was visited by many famous personalities. Groth was investigated by famous naturalists Ferdinand André Fouquet and Georg Hartung.