Ranch Ruins are a location from The Legend of Zelda: Breath of the Wild. These ruins are located in the Hyrule Field region of the Central Hyrule province. Link can find a Korok here by moving through the color changing flowers within the ruins. He could also defeat the Guardian Stalker and other enemies that reside there.
Lon Lon Ranch Ruins
The Ranch Ruins may be more than a reference but the ruins of the Lon Lon Ranch itself from Ocarina of Time, which existed one hundred years before the events of Breath of the Wild and might be destroyed during the Great Calamity. Moreover, according to Eiji Aonuma, Breath of the Wild is dated after the events of Ocarina of Time that consolidates this theory.