Chuo-Ku is one of the 23 districts in Tokyo which has Ginza and Tsukiji Fish Market. Chuo means "center" in Japanese, so you may see the word Chuo in the other places like in Osaka or Kobe. There is a train line called JR Chuo Line which runs between Shinjuku Station to Tokyo Station. There is also a private university called Chuo University in Tokyo.