The passage of short-term memories into long-term memories involves the hippocampus and multiple brain areas.

“the actual passage of short-term memories into long-term memories occurs in part within the hippocampus and then a lot of people don't know this some of the memories that we think of as long-term memories are actually distributed into the neocortex which is the outer portion of the brain”

“the formation of short and long-term memories is really a network phenomenon in fact among the more important themes that comes up again and again on this podcast anytime that we're talking about Neuroscience or actually biology in any case is that rarely if ever is there one location in the brain where something happens typically it's a network phenomenon meaning it's the collaboration of a bunch of different brain areas passing information from one location to the next and storing it in a kind of distributed way way”