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Which Cambodian river famously reverses its flow direction twice a year due to seasonal monsoon rains?

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Correct answer: Tonle Sap River

The Tonle Sap River connects the Mekong River to the Tonle Sap Lake. During the rainy season, the Mekong swells so much that it pushes water backward up the Tonle Sap River, expanding the lake to over five times its dry-season size. This unique event supports an incredibly rich freshwater ecosystem. Photo: Deror_avi, Wikimedia Commons, CC BY-SA 3.0.

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Source: Wikipedia (CC BY-SA)

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