list of regions on Io

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This is a list of named regions on Jupiter's moon Io. These names have been approved for use by the International Astronomical Union. The features listed below represent a subset of the total known bright regions on Io's surface with many currently not having an officially approved name. These areas are large-scale regions on Io's surface that are notable for their difference in brightness or color from their surroundings. In most cases, these areas are bright terrains, consisting of sulfur dioxide frost/ice fields, suggesting that they are colder than their surroundings.{{cite conference |title=Volcanism on Io: Results from Global Geologic Mapping |conference=LPSC XLI |location=The Woodlands (Greater Houston) |last=Williams |first=D. A. |display-authors=etal |date=2010 |id=Abstract #1351 |url=http://www.lpi.usra.edu/meetings/lpsc2010/pdf/1351.pdf|format=PDF}}

The names of regions on Io use a combination of a name derived from locations in Greek mythology associated with the nymph Io or Dante's Inferno, or from the name of a nearby feature on Io's surface and the descriptor term, regio, Latin for region. Coordinate, diameter, and name source below come from the IAU's Solar System Nomenclature Website.{{cite web | last=Blue | first=Jennifer |url=http://planetarynames.wr.usgs.gov/jsp/FeatureTypesData2.jsp?systemID=5&bodyID=7&typeID=35&system=Jupiter&body=Io&type=Regio,%20regiones&sort=AName&show=Fname&show=Lat&show=Long&show=Diam&show=Stat&show=Year&show=Orig | title=Io Nomenclature: Regio, regiones | publisher=USGS | accessdate= 2010-01-27 }}

See also the list of mountains on Io and the list of volcanic features on Io.

File:Io map regio labeled.jpg

class="wikitable" ! Regio !! Pronunciation !! Named after !! Coordinates !! Size
Bactria Regio	{{IPAc-en|ˈ|b|æ|k|t|r|i|ə}}	Bactria	{{coord|47.6|S|123.77|W|globe:io|name=Bactria Regio}}	665.68 km
Bosphorus Regio	{{IPAc-en|ˈ|b|ɒ|s|f|ər|ə|s}}	Bosphorus	{{coord|1.58|S|120.5|W|globe:io|name=Bosphorus Regio}}	1,615.15 km
Bulicame Regio		Bulicame (The Divine Comedy)	{{coord|34.85|N|190.82|W|globe:io|name=Bulicame Regio}}	498.0 km
Chalybes Regio	{{IPAc-en|ˈ|k|æ|l|ᵻ|b|iː|z}}	Chalybes	{{coord|57.5|N|86.21|W|globe:io|name=Chalybes Regio}}	760.56 km
Colchis Regio	{{IPAc-en|ˈ|k|ɒ|l|k|ɪ|s}}	Colchis	{{coord|1.63|N|205.01|W|globe:io|name=Colchis Regio}}	2,373.09 km
Illyrikon Regio	{{IPAc-en|ɪ|ˈ|l|ɪər|ᵻ|k|ɒ|n}}	Illyria	{{coord|69.85|S|169.04|W|globe:io|name=Illyrikon Regio}}	750.0 km
Lerna Regio	{{IPAc-en|'|l|ɜːr|n|ə}}	Lerna	{{coord|62.35|S|291.86|W|globe:io|name=Lerna Regio}}	581.26 km
Media Regio	{{IPAc-en|'|m|iː|d|i|ə}}	Media	{{coord|8.65|N|59.43|W|globe:io|name=Media Regio}}	2,654.02 km
Mycenae Regio	{{IPAc-en|m|aɪ|ˈ|s|iː|n|iː}}	Mycenae	{{coord|36.07|S|165.39|W|globe:io|name=Mycenae Regio}}	600.16 km
Tarsus Regio	{{IPAc-en|ˈ|t|ɑr|s|ə|s}}	Tarsus	{{coord|39.69|S|55.14|W|globe:io|name=Tarsus Regio}}	1,520.93 km