| Feature Name | Latitude | Longitude | Diameter (km) | Origin |
|---|
| Bactria Regio | -47.6 | -123.77 | 665.68 | Io passed through this area of ancient Iran in her wanderings. |
| Bosphorus Regio | -1.58 | -120.51 | 1615.15 | "Ford of the Cow"; Io wandered through here while trying to escape from the gadfly. |
| Bulicame Regio | 34.85 | 169.18 | 498 | Hot sulpher spring, the water of which sinful women were permitted to use in "The Inferno." |
| Chalybes Regio | 57.5 | -86.21 | 760.56 | Greek; Io passed through here in her wanderings. |
| Colchis Regio | 1.63 | 154.99 | 2373.09 | Greek; Io passed through this part of Asia Minor in her wanderings. |
| Illyrikon Regio | -69.85 | -169.04 | 750 | Io passed by here in her wanderings. |
| Lerna Regio | -62.35 | 68.14 | 581.26 | Greek; meadows of Lyrcea. |
| Media Regio | 8.65 | -59.43 | 2654.02 | Greek; Io passed through this part of Iran in her wanderings. |
| Mycenae Regio | -36.07 | -165.39 | 600.16 | Greek; in some legends, Io was transformed there. |
| Tarsus Regio | -39.69 | -55.14 | 1520.93 | Io passed through here in her wanderings. |
