Water colo(u)r

I have been away from MSFS a while and just starting enjoying it again. I am a little shocked that the water color is way wrong in certain areas of the world. For example, the river Thames and surrounding lakes and rivers are not sky blue in color in real life. We are talking tropical blue. This is true of many rivers and lakes etc. where they never appear that blue in real life anywhere in the world. Is there a way to change this, or is this something we are stuck with? I realize that they may be reflecting the sky, but that just isn't the way it looks in the air most of the time in real life. Sometimes it looks so bad I kinda want to turn it off lol!

Thanks for any input. 

Rich.