From GOOGLE
The "sad story of Annandale Station" refers to a tragic event that occurred at a cattle station in the heart of the Simpson Desert. The station manager's wife, allegedly driven mad by isolation and fear of starvation, poisoned her two young sons, aged eight and two, before killing herself. The station manager had left to work as a "ringer" for 18 months. Three bush graves, marked by wooden crosses, remain at the station site, commemorating the children's deaths.
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