The Dwarves, at one point (although it was a long time ago), have settled in Dunland. It was around 2790s, after the fall of Erebor, around the time of the war with the Orcs. It was still a long time before Gimli was born, though. But it is possible that some of them might have returned there, and especially given that he seemed to be well-traveled, why not. And it would have been possible for him to see the mountains of Moria from somewhere around there, I think? But that is just one theory that has occured to me.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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