Why was the Treaty of Versailles called a peace built on sand?

The Treaty of Versailles was termed a "peace built on sand" because it imposed harsh reparations and territorial losses on Germany, fostering resentment and economic instability rather than lasting peace. Its punitive measures failed to address the underlying issues that led to World War I, leaving many Germans feeling humiliated and disenfranchised. This environment of discontent contributed to the rise of extremist movements, ultimately paving the way for World War II. Thus, the treaty's inability to create a stable and just order rendered it fragile and ineffective.