Impassable Marsh (historical) USGS Thor Quad, Iowa, Topographic Map

Impassable Marsh (historical) is a Swamp in the state of Iowa (county of Humboldt), located at latitude - longitude coordinates (also known as lat-long or GPS coordinates) of N 42.73747 and W -94.04051. Impassable Marsh (historical) is shown in the center of the topographic (topo) map, which is sourced from the United States Geographical Survey map USGS Thor quad. The nearest major town is Thor, IA.