Rashi on Genesis 10:12/רש"י על בראשית י׳:י״ב

1העיר הגדלה THE GREAT CITY — This refers to Nineveh (not to Calah the last mentioned city nor to Resen), as it is said (Jonah 3:3) “Now Nineveh was an exceeding great city” (Yoma 10a).