Jökulsárlón lagoon in southern Iceland is a fascinating place for this - large blocks of ice break from the glacier at the top end and slowly float towards the

Jökulsárlón lagoon in southern Iceland is a fascinating place for this - large blocks of ice break from the glacier at the top end and slowly float towards the outlet of the lagoon to the sea. Near the outlet the iceburgs catch on the bed of the lagoon and tumble as they melt. There's a glorious variety of colours as the ice as the freshly exposed dark glacier ice is exposed - like in the attached article - before the ice surface melts and it returns to a white colour.