How do rivers change landscapes? A river is a large, moving body of fresh water. It flows through many different landscapes. The route of a river is the course. COURSE MOUTH RIVER SOURCE WORD BANK SOURCE MOUTH 14 · F O U R T E E N UPPER COURSE Rivers start in the MOUNTAINS. They are narrow and carry little water. They flow fast. LOWER COURSE At the COAST, rivers are wide and flow very slowly. Rivers end at the sea. MIDDLE COURSE On the PLAINS, rivers are wide and flow slowly. They collect water from tributaries, small rivers that flow into larger rivers. tributary
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