Bava Batra 56A

ברשות אחת ⁠– חייב, בשתי רשויות ⁠– פטור.

and in one domain, i.e., he carried half the dried fig into the same public domain each time, he is liable, but if it was in two domains, i.e., he carried the item into two separate public domains, he is exempt.

ואמר רבה: והוא שיש חיוב חטאת ביניהם, אבל כרמלית ⁠– לא. אביי אמר: אפילו כרמלית, אבל פיסלא ⁠– לא. רבא אמר: אפילו פיסלא.

And Rabba says in explanation of R' Yosei’s opinion: And this division of the public domain applies only where there is a property where one would incur liability to bring a sin-offering if one unintentionally carried out of it or into it, i.e., a private domain, between the two sections. But if there was only a karmelit, i.e., an area that is not defined as either a private domain or public domain and to and from which the prohibition against carrying is only of rabbinic origin, it does not divide the public domain. Abaye says: Even a karmelit divides the public domain into separate sections, but a beam [pisela] does not. Rava says: Even a beam divides the public domain, since it is no less than a boundary or sea squill, which do serve as a barrier between fields.

ואזדא רבא לטעמיה, דאמר רבא: רשות שבת כרשות גיטין דמי.

The Talmud notes: And Rava follows his own line of reasoning, as Rava says: The definition of a domain for the purpose of Shabbat is like the definition of a domain for the purpose of bills of divorce: Just as a beam is defined as a distinct domain for the purpose of bills of divorce, so too it is considered a distinct domain for the purpose of Shabbat.

אין שם לא מצר ולא חצב, מאי? פירש רבי מרינוס משמו: כל שנקראת על שמו. היכי דמי? אמר רב פפא: דקרו ליה ״בי גרגותא דפלניא״.

The Talmud returns to discuss the acquisition of a field that belonged to a convert who died without heirs. The Talmud asks: If there was no boundary and there was no sea squill, what are the limits to the acquisition? R' Marinus explains in the name of R' Yoḥanan: Any area that is called by his name. The Talmud asks: What are the circumstances where it is called by his name? Rav Pappa said: Where it is called: The place that is irrigated by so-and-so’s well. The entire area referred to as such would be considered one section with regard to acquisition.