Reference for Eruvin 187:14

אימא על מקום מחיצה מחלוקת

for did not R'Giddal citing Rab explain: This applies only to a case where their path had been lost<span class="x" onmousemove="('comment',' It being impossible to ascertain its exact position.');">²²</span> in that field?<span class="x" onmousemove="('comment',' B.B. 100a. While all individual in such a case cannot make the choice without the land-owner's consent or the authorization of a court, the public are entitled to make their own choice. This, however, does not prove that they can also appropriate a courtyard in which they have lost nothing.');">²³</span>

Jastrow