Comment by Archelaos

To my knowledge the largest factory in the world is BASF Ludwigshafen (Germany) with 10 km². Here is an aerial photo: https://de.m.wikipedia.org/wiki/Datei:LudwigshafenBASF2017-0... Followed by Volkswagen Wolfsburg (also Germany) with 6.5 km². Seems the BYD factory is competing with it for rank #2.