In Iceland, the Hvanná river, located at the north flank of the Eyjafjallajökull, was heavily charged with CO2 following the 2010 eruptions. Travertine precipitated along the river. By 2014, CO2 concentration in the river has decreased and travertine has started to dissolve. However, in places, where the river changed its bed, travertine covered rocks can still be seen.