This map visualizes U.S. stream names from the GNIS dataset. Each glowing point represents a named water feature.
Ephemeral names (arroyo, wash, gulch) suggest water that flows occasionally in dry landscapes.
Persistent names (bayou, swamp, marsh) imply slower, longer-lasting water.
These are linguistic clues — not direct hydrological measurements.
Includes common names like creek, river, and run. These are widespread and don’t strongly indicate water persistence.