Reference for Eruvin 116:2

וכמה עומקו של גיא אמר רב יוסף אלפים

- R'Joseph replied: Two thousand cubits. Abaye raised an objection against him: [If a glen was] a hundred cubits deep and fifty cubits wide one may span it, otherwise one may not! - He holds the view of 'Others',<span class="x" onmousemove="('comment',' With a capital O, sc. R. Meir (cf. Hor. 13b) .');">⁴</span> it having been taught: Others rule: Even though a glen was two thousand cubits deep but only fifty cubits wide one may span it.

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