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Coronas in Fortuna

Two large oval features can be seen in this image of Fortuna. On the left is Ba'het Patera, 230 km (138 mi) long and 150 km (90 mi) across. A portion of Onatah Corona, over 350 km (210 mi) in diameter, is visible on the right. Both features are surrounded by a ring of ridges and troughs. The central areas of the coronae contain radial fractures as well as volcanic domes and flows. Coronae may form due to the upwelling of hot material from deep in the interior of Venus. These two coronae may have formed at the same time over a single upwelling. The black strip represents missing data.

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