VALHALLA (CRATER)

'Valhalla' is the largest mutli-ring structure impact crater on Jupiter's moon Callisto. It has a bright central region 600 km across, an inner ridge and through zone and striking concentric rings extending to a diameter of approximately 3,800 km around that^[1]. The ring fracture system may have formed as semi-liquid material slumped towards the centre of the crater following the impact. The crater is named after Valhalla, Odin's hall in Norse mythology.
The central zone of 'Valhalla' has a knobby structure, where bright knobs are surrounded by dark smooth plains.

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References

1. Galileo views of the geology of Callisto, , R., Greeley, Planetary and Space Science, 2000