I haven`t dived quite enough of the world`s waters to say this categorically, but in all likelihood you will not find a bluer blue in all of nature than in those of Ras Mohamed Reef near Sharm el Sheikh. Photographed here with a Nikonos V, which has sadly seen no action since these images were taken in 1995.
Much to the consternation of the divemaster at our resort, my brother and I took a two-day beak from the undersea world, and hired a car with which to penetrate the Sinai interior. Hidden there lies Jebel Musa, thought to be Moses` Mount Sinai, famous for being the one place where God actually wrote something by His own Hand, namely the Ten Commandments.*
The top of the mountain is distastefully touristy, but the pre-dawn ascent is worthwhile for the clarity of the stars in the desert sky.
What a combo for a week`s holiday from Europe - Ras Mohamed and Mount Sinai. Can`t be beat.

* I subsequently discovered that St Paul informs us that this instead took place in north-west Saudi Arabia (Galatians 4 verse 25 in the Bible). Mount Sinai exists but it`s not the one you see in the pictures here! The real one is off-limits to tourists I understand.