The Pool of the Sun

One of the lakes in Siwa is the so-called Bath of Cleopatra, which in Antiquity was known as Spring of the Sun. Writing in the mid-fifth century BCE, the Greek researcher Herodotus of Halicarnassus tells that the water in this spring is warm in the early morning, gets cooler as the day proceeds, is quite cold when midday comes, and later gets warmer again, until at midnight, it boils and throws up bubbles.^note[Herodotus, Histories 4.181]. The description is exaggerated.