Heptastadion, Archaeological site in central Alexandria, Egypt.
The Heptastadion extends for 1,260 meters from the mainland to the former Pharos island, creating two natural harbors on each side.
Engineers constructed this causeway in the 3rd century BC during the Ptolemaic period to connect the mainland with the Pharos island.
The structure's name originates from Greek measurements, as its length corresponds to seven stadia, an ancient unit equal to 180 meters.
Modern visitors can observe the remnants of this ancient engineering work beneath the current urban development of Alexandria's central district.
The accumulation of sediments around the Heptastadion over centuries transformed it from a bridge into a solid landmass connecting former separate areas.
Location: Alexandria
GPS coordinates: 31.19944,29.88500
Latest update: May 14, 2025 11:45
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