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Tagssonar-anomaly
1 place carries this tag, across every kind and continent it appears in.
🇮🇳 India · Submerged site
Claimed 7500 BCE (dated wood not architecture) · Unknown claimed
2001 NIOT sonar detection of putative paleo-river channel structures and rectangular blocks at 20–40 m depth, announced as 9,000-year city; follow-up coring disputed.