My mistake. It is page 34 of the book, (page 51 of the PDF document available from the site seforimonline.org).
The exact quote from the book which is an english translation of the original is.
“Thence it is 2 days to El-Anbar which is Pumbedisa in Neharda. Here reside 3000 Jews and amongst them are learned men, at their head being the chief Rabbi, R’ Chen….”
The way I understand it, Pumbedisa is a city in Neharda (perhaps Neharda is a larger district made up of several cities?). It goes on to describe that the kevorim of Shmuel and R’ Yehuda are there as are the “synagogues which they built in their lifetime” (exact quote of the translation, did not see the original hebrew).
Whether it is the SAME yeshiva as existed in the gemara, I have no idea. Torah was being learned in the city if that answers your question.