But what exactly is it that makes the water appear blue?
Accoring to my high school knowledge of geography, The blue color which varies in intensity due to flow and weather, is the result of physical properties limestone which can be rightly described as "nanoscale" . The limestone is densely distributed in the water. The particles of this limestone are so tiny that the Rayleigh scattering of light most exalted by physicisists around the world, takes place. This simply means preferentially scattering of the blue color in the visible light.
I think This is detailed enough. I hope I find favour in your eyes and win @shaka. God bless you in advance.