List of quadrangles on Io

Last updated December 28, 2025

Io has been divided into 15 quadrangles.^[1]

Name	Number	Latitude range	Longitude range	Namesake	Features	Ref
	Ji1
Ruwa Patera	Ji2	50° N – 50° S	270°–90° W	Ruwa Patera	Kanehekili Fluctus	^[2]
Colchis Region	Ji3	50°N – 50° S	90°–270° W	Colchis Regio	Asha Patera, Kami-Nari Patera, Reiden Patera, Pillan Patera, Pele	^[3]
Lerna Region	Ji4	50°–90° S	0°-360° W	Lerna Regio		^[4]
	Ji5
	Ji6
	Ji7
	Ji8
	Ji9
	Ji10
	Ji11
	Ji12
	Ji13
	Ji14
	Ji15

References

↑ Maps of Io
↑ "Geologic map of the Ruwa Patera Quadrangle of Io (Ji2)". USGS. 1989. Retrieved 2025-12-27.
↑ "Shaded relief and surface markings of the Colchis Region of Io". USGS. 1984. Retrieved 2025-12-27.
↑ "Geologic map of the Lerna region (Ji-4) of Io". USGS. 1991. Retrieved 2025-12-27.

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[1] Maps of Io

[2] "Geologic map of the Ruwa Patera Quadrangle of Io (Ji2)". USGS. 1989. Retrieved 2025-12-27.

[3] "Shaded relief and surface markings of the Colchis Region of Io". USGS. 1984. Retrieved 2025-12-27.

[4] "Geologic map of the Lerna region (Ji-4) of Io". USGS. 1991. Retrieved 2025-12-27.

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