Tartary

Tartary (Latin: Tartaria) is a term that appears in historical use as a toponym, particularly in European sources, for a broad territory encompassing grand swathes of central Asia as well as Manchuria and Siberia, and in more contemporary use among certain quarters as the name of an empire or nation-state based in Central Asia of extraordinary advancement and technologic achievement that is supposed to have been destroyed by a deluge of mud and has subsequently been concealed from public attentions by a global conspiracy.