Jökulsárlón, a large glacial lagoon in Auster-Skaftafellssysla, (south east) Iceland. It recently became the deepest lake in Iceland at over 248 metres (814 ft) depth as glacial retreat extended its boundaries. The size of the lagoon has also increased fourfold since the 1970s. It is considered as one of the natural wonders of Iceland.
This up to 1000 years old snow has metamorphosed into highly pressurized glacier ice that contains almost no air bubbles. Thus it absorbs the visible light despite the scattered shortest blue fraction, giving it its distinct deep blue waved appearance. This cavity in the glacier ice formed as a result of a glacial mill, or moulin.