Aut cum scuto aut in scuto
That is clear water, my first thought is usually "looks warm!"! I couldn't make out the flag to see if it might be warm or not...
One could imagine the boat is levitating.
high magnesium content will do that.
Looks like the Greek Isles.
Can't tell what the flag is but it's not Greek.The palm trees say: "Come on in. The waters fine."