Swamp Features in Alexander County

Illinois · 3 features

Data Sources & Attribution

Feature data: U.S. Geographic Names Information System (GNIS) – U.S. Geological Survey.
Elevation: USGS Elevation Point Query Service (EPQS).
Topographic basemap: USGS National Map.
Quad map thumbnails: USGS US Topo.
Watershed boundaries: USGS Watershed Boundary Dataset (WBD).
Protected areas: USGS Protected Areas Database (PAD-US) – Gap Analysis Project.
Photos (where shown): Wikidata / Wikimedia Commons – individual licenses apply.
Printed map ordering: MyTopo Map Store.

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