Note 2673 — BOOK IV. AN ACCOUNT OF COUNTRIES, NATIONS, SEAS, TOWNS, HAVENS, MOUNTAINS, RIVERS, DISTANCES, AND PEOPLES WHO NOW EXIST OR FORMERLY EXISTED.
John Bostock translation
Hardouin speaks of this as existing in his time, 1670, and being 250 feet in length. It is supposed to have been first constructed about B.C. 411, for the purpose of uninterrupted communication with Bœotia.