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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/%D0%94%D1%83%D0%B2%D0%B0%D0%BB%D0%BE.jpg/300px-%D0%94%D1%83%D0%B2%D0%B0%D0%BB%D0%BE.jpg)
On 28 May 2014 "significant amount of smoke" was emitted by the feature, a historic first.[1]
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