Algar do Carvao

The Algar de Carvão is a volcanic chimney with a depth of 90 meters, and it was formed on the island of Terceira nearly 3,200 years ago after magma was deposited from the main chimney into the magma chamber by a volcanic eruption. It is considered one of the most attractive geological features in the Azores, as it consists One of the many caves has a distinctive collection of stalagmites and stalactites formed from deposits of silicic acid, which is unusual for this region.