[agracier]

The above screenshots look like they were flown around 12 noon, which is when the muddy water effect is greatest. I've found that around 15h or 9h is also a good hour of the day to get the brown water color, but then it's a bit less drastically brown ... with hazy weather conditions the landscape is bit softened in outlook too ... it's a bit of a shame that lakes can't keep a more normal blue water color, but there you have the limitations of the game ...

You'll probably find that the mountainous area has its own type of landscape as compared to the valleys in the river plain. I did a few dusk missions and the feeling is greatly enhanced by the oncoming darkness.