The River That Flows Backward
Deep in the heart of Southeast Asia lies one of the most unusual water systems in the world. Located in Cambodia, the Tonle Sap is both a river and a massive lake. What makes this system so special is a natural phenomenon that happens twice a year: the river completely reverses its direction of flow.
During the dry season, which lasts from November to May, the Tonle Sap behaves like most other rivers. Water from the Tonle Sap Lake flows south down the Tonle Sap River. It eventually connects with the giant Mekong River, and together they empty out into the ocean. During this time, the lake is relatively small and shallow. Local fishermen can easily navigate the waters, and life along the banks follows a steady, predictable rhythm.
However, everything changes when the monsoon season arrives in June. Heavy, continuous rains pour down across the region for months. This massive amount of water causes the mighty Mekong River to swell, rising to dangerous levels. The Mekong becomes so full that its water has nowhere to go. In an amazing display of nature's power, the rushing waters of the Mekong push against the Tonle Sap River, forcing it to stop and flow backward.
- Phenomenon:
- An unusual, rare, or significant fact or event that can be observed.
- Monsoon:
- A seasonal wind in South and Southeast Asia that brings heavy rains.
- Submerged:
- Completely covered or hidden underwater.
- Ecosystem:
- A community of living organisms interacting with each other and their physical environment.
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Preview questions from this passageShowHide
- 1In which country are the Tonle Sap River and Lake located?
- 2What unique natural phenomenon happens to the Tonle Sap River twice a year?
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About this informational passage for Upper Elementary
âThe River That Flows Backwardâ is a informational reading passage about The Tonle Sap River and Lake, written for Upper Elementary. It takes about 3 minutes to read (385 words) and comes with an interactive quiz and a printable worksheet with comprehension questions and an answer key.