© Luís Godinho (photo) / Marina Souvenirs
Sent by Lurdes
"The Algar do Carvão is an ancient lava tube or volcanic vent located in the center of the island of Terceira in the Azores. It lies within the municipality of Angra do Heroísmo in the parish of Porto Judeu.
The word, algar, is a Portuguese word that denotes a natural cavity in the earth that, unlike most caves or caverns, is vertical in its orientation, like a well. The Portuguese word derives from the Arabic word, al-Gar, which means "the crease". Carvão means "coal" in Portuguese, but the Algar do Carvão is not a source of coal; so, to call this geological feature "coal cavern" is more an acknowledgment of its darkness than the composition of the rock in which it was formed." In: Wikipedia
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