NABSQNO 16S-379520-4163110An unnamed natural arch in Gallatin County, Illinois Photo by Jay Wilbur NABSQNO 16S-379520-4163110. This unnamed shelter natural arch is located in Gallatin County, near Harrisburg, Illinois. It is within the boundary of the Shawnee National Forest. This arch appeared in the Vreeland catalog as number 14-8. Vreeland reported a span of 35 feet and a height of 6 feet.
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