Duvalo

Duvalo (Macedonian: Дувало) is an active geothermal surface feature situated close to the village of Kosel, near Lake Ohrid in the southwest of North Macedonia. Located at 740 metres above the sea level, it resembles a miniature crater with a diameter of 50 centimetres and a depth of 30 cm. Gaseous carbon dioxide and sulfur dioxide are released from the hole (therefore making it both a fumarole and a mofetta), and the smell of sulfur is said to be felt in a 3 kilometre radius around it. It represents the last traces of the historically significant volcanic activity in the area. During the Ottoman Empire it was used to mine sulfur.