Since the more active 2010 period where there were also green acid ponds at Dallol, the area had slowly become smaller and most of the green acids pond disappeared. This was probably linked to the unusual 4 years of no direct rain in the area. The much needed rainshowers at the end of 2015- start of 2016 brought back the green acid ponds and since then the colourful active Dallol hydrothermal fields have grown significantly. (Photo: Hans and Jooske)