Home / Azores Geopark / Algar do Carvão - Geosite, Angra do Heroismo
"Algar do Carvão" is a volcanic pit, on Terceira island, with a peculiar genesis, including both silicic formations (dated of 3,200 years B.P.) and basaltic products. This 90 m depth pit has a lake and exhibits stalactites and stalagmites of amorphous silica.