The 12th millennium BC spanned the years 12,000 BC to 11,001 BC (c. 14 ka to c. 13 ka). This millennium is during the Upper Paleolithic period. The Paleolithic-Mesolithic transition began in the Near East during this millennium.[1] It is impossible to precisely date events that happened during this millennium, and all dates associated with this millennium are estimates mostly based on geological analysis, anthropological analysis, and radiometric dating.