Idaho Falls pertains to the name of the waterfall on the Snake River and the name of the city it is in, but there may be some question about its legitimacy.
Idaho Falls City Images – Browse 1,010 Stock Photos, Vectors, and
Idaho Falls Temple From Broadway Bridge Giclee Print, Idaho Falls
Idaho Falls - A Modified Urban Waterfall on the Snake River
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Idaho Falls, Idaho - Wikipedia
Central Valley, Idaho Falls, ID