Regiones on Io
10 named features carry the IAU descriptor Regio — a large area distinguished by its brightness or colour on Io, out of 51 in the mapped Solar System.
Named
10
of 260 named places on Io — 3.8%
Largest
2,860 km
Colchis Regio
Median size
880 km
Across the 10 with a measured diameter
Named between
1979–2006
IAU approval dates
How regiones on Io get their names
The IAU assigns each feature class on each world a naming theme. Across the 10 regiones with a recorded origin, 2 categories appear, led by Greek.
Greek9Italy1
All 10 regiones on Io
Every one has its own page, on the surface it sits on.
Regiones elsewhere in the Solar System
The same descriptor is used on 6 other worlds, for 41 more features.