The Blood Lake of Iraq is situated just outside Iraq’s Sadr City. This amazing red lake has led to numerous speculation that looks like blood. The researchers have though pointed out that the reservoir is pretty big and putting a huge amount of blood into the reservoir to get it tainted red.
However, various stories have been speculated that local butchers cut their animals and dumped their blood and offcut into the reservoir. But that would have been required a more distinctive brown tinge. Though, several believe the red lake is the result of chemical pollution.
There is a possibility that severe increases in salt levels are known to cause water to turn blood red. Could also potentially be some sort of algal bloom. So far, only one image is available on Google earth.