From NASA's Planetary Photojournal
This image was acquired by Voyager 1 as it approached close passage by the south pole of Io, the innermost of the four large Galilean satellites, at a range of 82,500 kilometers and shows an area approximately 600 km (350 miles) on a side. The sun shines from the left about 45 above the horizon as seen from the surface. The region shown is in Io's equatorial region and contains a myriad of complex features. A variety of features are visible: mountain and plateaus bounded by scarps that vary from irregular to linear, vast smooth plains, rough bright areas that may evidence curious erosion.
Image Title: Io - South Pole
Catalog #: PIA02249
Target Name: Io
Spacecraft: Voyager 1
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Last Modified On: Monday, December 18, 2000