Mishnayos Kilayim Perek 4 Mishnah 3

אין זה אלא גדר הכרם (this [space between the vineyard and the fence] is only [the area of] the fence of the fence of the vineyard) the place that is between the fence and the vineyard is called the fence of the vineyard, even if there aren’t there other than six cubits, he distances it four cubits and sows the remainder [of the vineyard].

ואיזהו מחול הכרם – that requires twelve cubits, it is the space between two vineyards. But the first Tanna/teacher holds that the place between two vineyards is judged like the vineyard that was destroyed in the middle, and in the Talmud of the Land of Israel, it proves that Rabbi Yehuda did not say, “And what is the outer space of the vineyard? The area between the two vineyards,” but rather, as for example, that the rows of the vineyards are not equivalent one to the other, as for example, the vineyard of this side of the free space of their wows from east to west and that is one the other side from north to south, for if they were corresponding, Rabbi Yehuda admits that they appear like the razed portion of the vineyard and would require sixteen cubits. But the Halakha is not according to Rabbi Yehuda.

איזהו גדר – A person who separates between the vineyard is able to place a vineyard from this side and to sow from the other side, and similarly for a ditch.