SP is 3 km (1.86 miles) below surrounding terrain
1,300 x 900 km (808 x 560 miles) ellipse
See a clear rim
Do not see clear secondaries (perhaps erased by glaciers)
No clear rings, but the mountains sort of line up where you expect rings
Lack of rings/secondaries is reminiscent of Hellas, Mars
There is a 1 km (0.6 miles) thick ejecta "collar" around SP!
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