Reference for Eruvin 121:16

השתא נמי מטטרגי בני חמתן לבני גדר כולי האי לא כייפי להו

might not the people of Hamethan molest those of Gader? - No; they<span class="x" onmousemove="('comment',' The people of Gader.');">⁴⁹</span> were not so submissive as all that.<span class="x" onmousemove="('comment',' Though the Gaderites, as visitors, would seek no quarrels at Hamethan, they would nevertheless defend themselves if attacked. rhg');">⁵⁰</span> R'Safra explained: Gader<span class="x" onmousemove="('comment',' So with R. Han., contra Rashi (cf. Tosaf. s.v. a.l.) .');">⁵¹</span> was a town that was built in the shape of a bow.<span class="x" onmousemove="('comment',' Whose ends were four thousand cubits apart. In such a case (cf. supra 55a) the Sabbath limit is measured from the imaginary chord of the bow. The limit of Gader consequently included Hamethan which was no more than two thousand cubits distant from the chord. The position of the latter town, however, whose limit terminated at the Gader chord which was more than two thousand cubits distant from the center of its arc, prevented its inhabitants from walking to Gader which thus lay beyond their Sabbath limit.');">⁵²</span>

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