The Brennisteinsalda is a volcano in the south of Iceland. The name means in English: sulphur wave. It comes from the sulphur spots which have coloured its sides. But there are other colours, too: green from mosses, black and blue fromlava and ashes, red from iron in the earth. It could very well be the most colourful mountain of Iceland and so its picture is often found in books and calendars.