Unit 2 · Neighbors & Borders
Rivers as highways, lifelines, and borders
The Danube flows through or borders more countries than any other river: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, Ukraine. It connects Vienna, Budapest, and Belgrade. The Danube was the Roman Empire's northern frontier for centuries.
The longest river in Africa (6,650 km). 95% of Egyptians live within a few km of the Nile — the rest is desert. Egypt's entire civilization exists because of this river. Now Ethiopia's Grand Renaissance Dam threatens Egypt's water supply, creating serious geopolitical tension.
Not the longest, but BY FAR the biggest by water volume — 20% of all river water entering the ocean. The Amazon basin covers 40% of South America. It's so wide in places that you can't see the other side. Over 3,000 species of fish (more than the entire Atlantic Ocean).
Flows through China, Myanmar, Laos, Thailand, Cambodia, Vietnam. 60 million people depend on it for fishing and farming. China's dams upstream are reducing water flow to Vietnam and Cambodia, destroying fisheries and causing diplomatic fights.
The Rhine carries more cargo than almost any river on Earth. It connects Switzerland, Germany, France, and the Netherlands, ending at the massive Rotterdam port. Without the Rhine, Europe's economy would look completely different. It's basically a liquid highway.
Forms 1,900 km of the US-Mexico border. Mexicans call it 'Río Bravo.' It's a political flashpoint for immigration debates. In some places it's so shallow you can walk across. In 2023, parts actually dried up completely for the first time in recorded history.
Answer all ten, then see your stars. You can retake it as many times as you like.
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