Rabbah once saw a sea-monster on the day it was brought forth, and it
was as large as Mount Tabor. And how large is Mount Tabor? Its neck was
three miles long, and where it laid its head a mile and a half. Its dung
choked up the Jordan, till, as Rashi says, its waters washed it away.
THE TALMUD, _Bava Bathra_, fol. 73, col. 2.