Sometimes it’s just to reflect a popular understanding of where a river is located. In Austin, Texas, the Colorado River (not the one that forms the Grand Canyon) flows through Lake Austin and Lady Bird Lake, two reservoirs so linear that no one considers the river to end and resume at the Austin City Limits (not the concert series). Any mid- or low-zoom level rendering of this metropolitan area ought to depict a continuous Colorado River. A chatbot ought to tell you that Austin sits on the Colorado River, and only then mention these lakes as additional detail.
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