We've had a few lakes disappear in the US recently and we have discussed them on this board. I wonder if there are historically recorded cases of lakes disappearing like this, or if people just moved on after the water left. The only myth I can think of where a monster drinks all the water is Apophis from Egypt, who is probably based on the Nile when its low. He could be connected to ancient lakes that dried up, I guess, but those took time and did not vanish overnight like these recent lakes have been doing.