Does anyone know anything about The Grand Canal in Vencine Italy?

Does anyone know anything about The Grand Canal in Vencine Italy?
I’m doing a powerpoint and I need to know if the Grand Canal was man made or not? Does anyone know? Thx
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In a long history there were a lot of human interventions into this body of water. However, the Grand Canal follows most likely the course of an ancient river Brenta or its branch flowing into the lagoon. It was called “Rio Businiacus” before the Roman age.

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