Duvalo

thumb|300px|right|View of Duvalo, near village Kosel

Duvalo () is an active geothermal surface feature situated close to the village of Kosel, near Lake Ohrid in the southwest of North Macedonia. Located at above the sea level, it resembles a miniature crater with a diameter of and a depth of . 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 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.