
The Illinois River creates a dynamic western boundary for this region, winding past a series of large riverine landforms including Twelvemile Island and Helmbold Island. This 2024 survey captures the intricate wetland ecosystem of the Two Rivers National Wildlife Refuge, where a complex network of backwaters like Upper Stump Lake, Flat Lake, and The Glades dominate the low-lying bottomlands.
47 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1903 · O'Fallon
USGS Topo · 1:125,000
1927 · St. Charles
USGS Topo · 1:62,500
1930 · Hardin
USGS Topo · 1:62,500
1930 · Jerseyville
USGS Topo · 1:62,500
1931 · Brussels
USGS Topo · 1:62,500
1933 · Jerseyville
USGS Topo · 1:62,500
1933 · Saint Charles
USGS Topo · 1:62,500
1934 · Hardin
USGS Topo · 1:62,500
1938 · Hardin
USGS Topo · 1:62,500
1939 · Brussels
USGS Topo · 1:62,500