"hunger stone : A stone, either naturally exposed or intentionally embedded in a river during a..."

“hunger stone : A stone, either naturally exposed or intentionally embedded in a river during a drought, which is dated and often inscribed to mark the water level as a warning to future generations that they may face famine if the water reaches that low level again. Such stones are common in Central Europe.”

- https://en.wiktionary.org/wiki/hunger_stone#English

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