The Heptastadion was a giant causeway, often referred to as a mole or a dyke built by the people of Alexandria, Egypt during the Ptolemaic period. It connected the island on which the Pharos lighthouse stood to the mainland. It is also believed to have served as an aqueduct while Pharos was inhabited. Due to silting over the years, the former dyke now forms the Mansheya isthmus. Its name comes from its length: seven stadia (Hepta meaning seven).
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- Bertrand Millet; Goiran, Jean-Philippe (2007). "Impacts of Alexandria’s Heptastadion on Coastal Hydro-Sedimentary Dynamics During the Hellenistic Period". The International Journal of Nautical Archaeology 36 (1): 167–176. doi:10.1111/j.1095-9270.2006.00131.x.
- "The Ptolemaic Legacy". Retrieved 2008-02-11.
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