An unnamed alcove natural arch, Gallatin County, Illinois
Photo by Jay Wilbur
NABSQNO 16S-378420-4162515. This unnamed alcove natural arch has eroded through Caseyville sandstone. It is located a short walk from the main road through Garden of the Gods, within the Shawnee National Forest, Gallatin County, Illinois. Vreeland included this arch in his catalog as number 23-28 and reported a span of 21 feet.