https://phys.org/news/2018-07-image-sharm-el-sheikh.html > This striking true-colour image shows the Gulf of Aqaba at the top centre, feeding into the Red Sea – home to some of the hottest and saltiest seawater in the world. The Red Sea is connected to the Mediterranean Sea via the Suez Canal, one of the world's busiest waterways. > Usually an intense blue-green, as captured in this image, the Red Sea is known, on occasion, to turn reddish-brown owing to algal blooms, which change the colour of the sea when they die off.