What is "Es Tuv Eretz Mitzrayim"?
Rashi #1: It is Eretz Goshen.
Rashi #2: Pharaoh unknowingly prophesized 1 that when Yisrael were redeemed from Egypt, they would take all the wealth of Egypt with them, leaving it [empty] like the depths of the sea - where there are no fish.
Riva: He meant to say "Goshen". He mistakenly said "Mitzrayim". He was unaware of his prophecy.
רש"י: כמצולה שאין בה דגים: מה משמעות הדבר?
גור אריה: אין דרך הדגים להיות בעומק הים, ולכן אמרו 'כמצולה שאין בה דגים'.