Big Marsh
Swamp in Lee County, Illinois · on the USGS Amboy quadrangle
41.68506, -89.30561
Maps that show Big Marsh
Get them in the map app
Amboy, IL
Detailed map of terrain, trails and roads
USGS topo, 2024
Amboy, IL
Old map for history, not navigation
USGS historical 15-minute topo (1951)
Continental Glaciation Map - Tule Springs Fossil Beds National Monument
National Park Service Maps · Tule Springs Fossil Beds National Monument
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-28 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).