This may be difficult...this may be easy :-)
This was in March, and the water is actually that blue.
I think you'll have to give us a pretty good clue on this one...there's not enough info in the pic. But the water sure is blue, could be many places in canada, alaska, great lakes, and/or northern europe.
Agreed, This one should help out, and here is another one that is a little bit easier and fun(big hint, that bay is called emerald bay) :-)