How are you, part 4 of your route is the most dazzling with those landscapes that have very blue waters but maybe in the water the blue of the sky is reflected or is an effect that you do in the lens of your camera, I am surprised with your This is a very beautiful site and it took time to share it.
And with regard to your question, I think this has to do with the solar rays, the water absorbs them and these tones are given that the water is transparent, I think it also helps the limestone that is in it besides the cliema and the agitation of water.