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The River Clyde (, ) is a major river of western Scotland and the third-longest in the country at about 170 km in length. Its river network extends to 4,244 km and drains a basin of 1,903 km², expanding to 3,854 km² when the Clyde estuary system with the Kelvin, White Cart, Black Cart and Leven is included. Around 1.79 million people, 33.8%

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