The Unseen Border: Why Lake Constance Has No Single Boundary Topic: Geometric vs. Natural Borders in Central Europe Data Type: GeoJSON / TopoJSON Projection: EPSG:3857 (Web Mercator) The Lesson Most international borders follow rivers, ridges, or lines of latitude. But Lake Constance ( Bodensee ), touching Germany, Austria, and Switzerland, has a cartographic anomaly: No legally defined border in its main body.
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