משנה אויף שמות 27:18

Rabbi Judah says: [the enclosure may be only] as large as two bet se'ah. They said to him: they only prescribed [the limit of] two beth se’ah for a garden or a karpaf only, but if [the enclosure] was a pen, or sahar, a backyard or courtyard even if it is five or ten bet kor, it is permitted. And it is permitted to remove [the posts] to any [distance] provided one increases the posts.

Rabbi Judah ben Bava further said: a garden or a karpaf whose [area does not exceed] seventy cubits and a fraction by seventy cubits and a fraction, which is surrounded by a fence ten handbreadths high, it is permitted to carry within it, provided there is in it a watchman’s hut or a dwelling place or it is near to a town. Rabbi Judah says: even if it contained only a cistern, a ditch or a cave it is permitted to carry within it. Rabbi Akiva says: even if it contained none of these it is permitted to carry within it, provided its area [does not exceed] seventy cubits and a fraction by seventy cubits and a fraction. Rabbi Eliezer says: if its length exceeded its breadth even by a single cubit it is not permitted to carry within it. Rabbi Yose says: even if its length is twice its breadth it is permitted to carry within it.