Good observation- I'd be willing to bet that most of this object has already sublimated away over time. It could be a monstrous comet nucleus captured by Saturn long ago, although I haven't investigated it's orbit to see if this is a possibility from that perspective.

From: Canopus56 <canopus56@yahoo.com>

Maybe it's an optical illusion, but isn't the "floor" of the concave crater convex? - Canopus56(Kurt)

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