Here we have another waterfall, Sigöldufoss. As I mentioned earlier, the rivers get their water from rain and so on, or from glaciers. In case, a river gets the water directly from a glacier, you’ll find sediments in the water. Thus the water isn’t clear, but colored. Often the water from a glacier river is white. That’s, because all these tiny, dust-like particles reflect the light differently.
The photo on top of this post shows such a situation. Inside the canyon on the left hand, you can find a fresh water waterfall. In the pool below this waterfall, you can distinguish easily between the water coming from a regular river and those, coming from a glacier. The water near the exit on the left, you can see water in two different colors, do you?