Reference for Eruvin 15:19

והא נמי תנינא חצר שהרבים נכנסין לה בזו ויוצאין לה בזו רה"ר לטומאה ורה"י לשבת

Some there are who say: R'Joseph B'Abdimi stated: A Tanna taught that the Sages permitted it, and R'Nahman said: The halachah is not in agreement with the ruling of the Sages. Meremar partitioned off Sura<span class="x" onmousemove="('comment',' From the river or canal (cf. B.B., Sonc. ed., p. 294, n. 5 and text) which ran along the backs of alleys that at their other ends opened out into a public domain.');">²⁶</span>

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