The Red Sea itself is very narrow, with a length of 2350km and width of 350km, joining the Mediterranean with the Indian Ocean. The entrance is at a depth of 134m approaching almost 2000m in the Gulf of Aqaba, where Dahab is situated on the Sinai coastline. As part of this coastline, Dahab offers easy shore diving access to what is virtually solid fringing reef.
The Red Sea was formed around 40 million years ago and takes its name from certain algae which form a red outer coating that turns the sea red during seasonal blooms.
Watching a sunset in Dahab gives the impression that the surrounding mountains themselves create the reddish hue of the sea. The Red Sea has no freshwater influents, and the limited circulation with the Indian Ocean only just allows enough water volume compensation for evaporation.
Thus we have a strong salinity percentage here compared to other seas, in fact amongst the highest on the planet. Volcanic activity on the sea bed means that the Red Sea is also warmer than other seas. At 1km the Indian Ocean water temperature registers around 6-7 degrees.
At the same depth, the Red Sea reads an astonishing 21 degrees. The hottest on Earth.