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From Liquipedia Counter-Strike Wiki
Ancient (de_ancient) is a bomb defusal map in Counter-Strike: Global Offensive. It was created by Valve and introduced on December 3rd, 2020 as part of the Broken Fang operation.  On May 3rd, 2021 when Operation Broken Fang concluded, Ancient replaced Train in the Active Duty Map pool while Train went into the Reserve Map pool.