ⓘ Ptolemaic Alexandria ..

Heptastadion

The Heptastadion was a giant causeway, often referred to as a mole or a dyke built by the people of Alexandria, Egypt in the 3rd century BC during the Ptolemaic period. The Heptastadion was created to link Pharos Island to the mainland coast and given a name based on its length. Overall it was more than three-quarters of a mile long.