It shows two examples of the colour of the water we saw when sailing to the Arctic Circle.
The change was dramatic, almost like the boundary between two rivers, and we crossed between the two colours several times while we were between Iceland and Greenland.
Since then I did a bit of Googling and found the picture at the top, taken by NASA's Terra satellite. It beautifully shows the phytoplankton bloom that caused this colouration.
It is also this bloom that makes these waters so rich in wildlife, such as the dolphins and whales we were lucky enough to see.
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