Shulchan Arukh Orach Chayim · Siman 403

English

The Laws Applying to a Group of Fields that Non-Jews Enclosed [on Shabbos], [The following laws apply when a person] spent Shabbos in a group of fields and non-Jews enclosed [the area] on Shabbos with partitions erected for the purpose of habitation One may only carry an object in a public domain that is not completely enclosed by walls, roofs, and partitions up to a distance of four cubits, unless an eruv has been established. It is permitted to [transfer articles] within the entire [enclosure, if the person does so] by throwing [the article], for [the person] may throw an article even beyond the 2000 [cubits comprising his Shabbos limits]. It is considered as if it is surrounded by a wall for the purposes of carrying inside it on Shabbat But to carry something beyond four cubits is prohibited, even within two thousand cubits (Beit Yosef citing Tosafot and Hagahot Ashri, chapter of "Mi She'hutziah").