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Tagsenigmatic-walls
1 place carries this tag, across every kind and continent it appears in.
🇦🇷 Argentina · Hypothetical site
Holocene natural / possibly Late Holocene human (unvalidated) · Unassigned Huarpes / Comechingón? / Jesuit?
Erosive 4000 ha Potrero de la Aguada amphitheatre inside Quijadas range — 40–80 m low stone walls bracketing stream forks, culture debated.