Reference for Shabbat 200:8

רב הונא אמר מוציא הימנה זיז כל שהוא וממלא קסבר כרמלית מארעא משחינן ואוירא מקום פטור הוא ובדין הוא דזיז נמי לא ליבעי אלא כי היכי דליהוי ליה היכרא

Hence logically not even a projection is required.<span class="x" onmousemove="('comment',' For one may certainly carry from a place of non-liability. ');">¹⁸</span> but [it is placed there] to serve as a distinguishing mark.<span class="x" onmousemove="('comment',' That one may not carry from a real karmelith. ');">¹⁹</span> R. Hisda and Rabbah son of R. Huna both maintain: One rigs up an enclosure four square and draws [water]': they hold that the <i>karmelith</i> is measured from the surface of the water, the water being [as] solid ground.<span class="x" onmousemove="('comment',' The sea-bed and the sea count as one, as though the ground of the karmelith rose very high. ');">²⁰</span>

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