Rif Eruvin 6a {Eruvin 18a continues ... 21a}

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6a

{Eruvin 18a continues}
Rabbi Yehuda says: {There is an upper limit -} until bet satayim. {The amount which can produce two seah of grain}.
The Sages said to him: {The limit of} a bet satayim was only said regarding a garden or a wood shed {which are not meant to serve as habitations}, but if it was a cattle-pen, a fold, a courtyard, or a backyard, even as much as 5 bet kor is permitted. And thus it is permitted to distance {the strips} any amount {from the well} provided you increase the number of strips.

{Eruvin 20b}
Gemara:
Rabbi Yitzchak bar Adda said: These strips around wells were only permitted to pilgrims to the festivals {olei regalim}.
But we learnt {in a brayta}: Strips around wells were only permitted to animals.
What animals? Animals of the pilgrims of the festival, but a human must climb up and climb down {the well}.

{Eruvin 22a}
Mishna:
Rabbi Yehuda says: If a public road cuts through them {=the pasin}, it should {instead} be diverted to one side {for otherwise it will nullify the partitions}.
And the Sages say: This is not required.
{Eruvin 22b}
For a public well, a public cistern {=bor; in a cistern, the water might be dried up}, and a private well, we may make pasin, but for a private cistern, we make it a partition of 10 handbreadths high. These are the words of Rabbi Akiva.
Rabbi Yehuda ben Bava says: We only make pasin for a public well, while for the rest, we make a rope fence {as discussed in the previous perek} ten handbreadths high.

{Eruvin 23a}
Gemara:
Rav Yehuda cited Shmuel: The halacha is like Rabbi Yehuda ben Bava.
And Rav Yehuda cited Shmuel: They only permitted pasin for wells of spring water.
And we need {both statements}. For if we had only heard that the halacha is like Rabbi Yehuda ben Bava, I would have believed this meant in terms of being public, even it contained gathered {rain} water, and this that it said a public well, this comes to exclude Rabbi Akiva. Therefore it informs us that pasin of wells were only permitted for wells of spring water. And if we had only heard that the only permitted pasin for wells of spring water, I would have believed that it did not matter whether it was the public's or an individuals. Therefore it informs us that the halacha is like Rabbi Yehuda ben Bava.

{Eruvin 21a}
Rav Yirmiya bar Abba said: The isolated huts {which extend the city limits before the techum begins} and the pasin of wells do not apply in Bavel or in other countries {except Eretz Yisrael}. The law of isolated huts does not apply in Bavel because bursting of dams is common; in other countries it also does not because thieves are common. pasin of wells in Bavel is not applicable because water is common {=in abundance}, and outside of Israel also no because academies {of learning Torah} are not common {and so the travellers are not comparable to olei regalim}.

Rav Chisda said to Mar the son of Rav Huna the son of Rav Yirmiya bar Abba: