At the end of Forward the Foundation, Hari talks about sending Wanda away from Trantor:
“No, Wanda,” Seldon replied, his voice choked with emotion. “I don’t want you to leave, but it is the only way. You and Stettin must isolate yourselves from the crude physicality of Trantor.
and he is vague about where the Second Foundation is (or will be) located, and uses the Star's End clue that is used in earlier books:
“But, Grandfather,” Wanda said as she stood with Palver, preparing to leave. “Where shall we go? Where is the Second Foundation?” Seldon looked up and said, “The Prime Radiant has already told you, Wanda.” Wanda looked at Seldon blankly, searching her memory. Seldon reached out and clutched at his granddaughter’s hand. “Touch my mind, Wanda. It is there.” Wanda’s eyes widened as she reached into Seldon’s mind. “I see,” Wanda whispered to Seldon. Section 33A2D17: Star’s End.
He goes on to note that he's not even seen Wanda:
I miss Wanda. It has been many years since I’ve seen her, sat with her quietly, holding her hand. When Wanda left, even though I had asked her to go, I thought I would die of heartbreak. That was, perhaps, the most difficult decision I ever had to make and, although I never told her, I almost decided against it. But for the Foundation to succeed, it was necessary for Wanda and Stettin to go to Star’s End.
What's Asimov doing here? We know that the Second Foundation is…
on Trantor itself, at the Galactic Library, not far at all from Hari at Streeling University.
So why all the obfuscation at this point?
I assume he's trying to cater for people who might read the series in chronological order: they won't know that, at this point.
But surely he goes too far, with the "many years since I've seen her"?
Or is the point that…
it's important for the Second Foundationers to be entirely socially isolated from Trantor, even to the extent of having no contact whatsoever outside the Library?
I don't recall that being discussed in detail, though.