River Tree

Real OpenStreetMap river and stream reaches around the Colorado-Green confluence, drawn as one blue ramp by channel rank (rivers dark and thick, streams light and thin): a dendritic drainage network with the same self-similar branching as Chapter 8's recursive tree, except the forks are the basin itself.

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Chapter 8 (Fractals). Self-similarity in a real drainage basin: OSM waterway=river vs waterway=stream as trunk and twig, mapped geometry rather than an invented L-system.

Data: OpenStreetMap waterways via Overpass API, Colorado-Green confluence near Canyonlands, UT.