HistoryNeolithic (c. 9600–8000 BCE)Southeastern Turkey (Anatolia)high confidence

A bedrock pit at Göbekli Tepe measures 25 feet across and almost 8 feet deep.

Notes on verification

Verbatim match to Archaeology Magazine's Curry article, corroborated by secondary source, and independently confirmed in scale/interpretation by a peer-reviewed DAI publication (Lee Clare) describing a comparable bedrock-carved cistern pit, with minor measurement variance typical of irregular archaeological features.

Sources