[wyattpeak]

For anyone as confused as me, from Wikipedia:

> [Hunger] stones were embedded into a river during droughts to mark the water level as a warning to future generations that they will have to endure famine-related hardships if the water sinks to this level again.

[mytailorisrich]

I think there is a similar concept in Japan about marking the high point of Tsunamis as a warning for future generations.

[MonkeyMalarky]

"If you see me, weep"