NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Colour-coded topographic map of the surface of Venus, compiled from radar data recorded by the Pioneer-Venus spacecraft. Most of the planet's surface is covered by relatively smooth plains, coloured blue in this image. Several large highland regions are visible (yellow). The largest of these (top) is Ishtar Terra, a "continent" about the size of Australia. At lower right is Aphrodite Terra, and at lower left a line of three highland regions; Beta Regio (top), Phoebe Regio (centre) & Themis Regio (bottom). In the centre of Ishtar Terra are the Maxwell Montes (red & white), the highest mountains on Venus.
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