Reference for Kiddushin 143:1
והאידנא הוא דליוה פרסאי אמר ליה אביי לרב יוסף להא גיסא דפרת עד היכא אמר ליה מאי דעתיך משום בירם מייחסי דפומבדיתא מבירם נסבי
but now the Persians have set it higher.<span class="x" onmousemove="('comment',' Above Fort Tulbakene; hence Abaye and R. Joseph were not opposed to this.');"><sup>1</sup></span> Abaye said to R'Joseph: How far does it extend on this [sc. the west] side of the Euphrates? Said he to him: What is your motive [in asking]: on account of Biram?<span class="x" onmousemove="('comment',' Which lay on the west of the Euphrates, some miles N.W. of Pumbeditha.');"><sup>2</sup></span> The most distinguished [families] of Pumbeditha took [wives] from Biram! R'Papa said: Just as they differ over family purity, so they differ over divorce.<span class="x" onmousemove="('comment',' If one brings a divorce from any country except Palestine and Babylon, he must declare that it was written and attested in his presence. R. Papa maintains that the controversies on the boundaries of Babylon apply to this too.');"><sup>3</sup></span>