Reference for Bava Batra 205:7
הכא מאי אמר רב פפא אע"פ שאין מלאים מים מאי טעמא אין אדם רוצה שיתן מעותיו במקום אחד ויראו לו כשנים ושלשה מקומות
— R. Papa said: Even though they are not full of water. What is the reason? — A person does not wish to invest his money in one plot which has the appearance of two or three plots.<span class="x" onmousemove="('comment',' The clefts and the rocks break up the unity of the field and this involves more labour in ploughing, sowing and harvesting. ');"><sup>19</sup></span> Rabina raised an objection: Surely, [the clefts] were mentioned in an analogous position to that of the rocks; as the rocks [are excluded] because they are unsuitable for sowing so these also [should be excluded only] when unsuitable for sowing? — The similarity to rocks refers to [the case where they are] less<span class="x" onmousemove="('comment',' The Mishnah, in its second clause, teaches that in such a case they are included in the field even though they are full of water and are unsuitable for sowing as the rocks. The first clause, however, as R. Papa said, excludes clefts of ten handbreadths deep even though they are not full of water. ');"><sup>20</sup></span> than [ten handbreadths].