Name Stadion
Japanese スタディオン
Greek Στάδιον

A stadion (Japanese: スタディオン, Greek: στάδιον), plural stadia (Japanese: スタディア, Greek: στάδια), is an ancient Greek measurement with the length of one Greek stadion or approximately 180 meters. Since not all Greek stadia were equally long, this measurement can vary one or two meters depending on what stadion you take as a reference.

In Chapter 1: The Globe, Hermias describes the size of the globe in stadia during his interrogation. At the end of the same chapter, the Hellespont is mentioned to be 20 stadia long to cross.