Xerxes Canal

The Athos peninsula in northeastern Greece, that juts into the Aegean Sea for some 50 kilometers, was once bisected by a canal a hundred feet wide. The canal was built by king Xerxes I of Persia in the 5th century BC as part of the preparations for his intended invasion of Greece in 480 BC. The motivation behind this monumental earth-moving project stemmed from the disastrous experience of Persian commander Mardonios, who, twelve years earlier, attempted to navigate his fleet around the perilous cliffs of the Athos peninsula during the First Persian invasion of Greece. The peninsula's treacherous waters claimed a considerable portion of King Darius's fleet—some 300 ships and 20,000 men—during a storm. The Xerxes canal as it would have appeared if it still existed. Image credit: Konstantinos Tamateas/Wikimedia Commons In a bid to avoid a similar catastrophe, Xerxes tasked his engineer Artachaees with constructing a canal across the narrowest stretch of the peninsula. Over three years, forced laborers toiled to create a canal spanning two kilometers (1.2 miles) in length and 100 feet in width, allowing passage for two triremes simultaneously. The canal's design featured inward-sloping sides, narrowing to roughly 50 feet at the bottom and lying approximately 45 feet beneath the surface. Upon the successful passage of the Persian fleet through the canal en route to the Battle of Artemisium, Xerxes made little effort to preserve the canal as a permanent waterway. Over time, the canal fell into disuse and became filled with silt. Remnants of this engineering marvel can still be observed on the isthmus between Nea Roda to the north and Tripiti to the south, marking the narrowest point of the Athos peninsula. This canal not only stands as a remarkable testament to Persia's brief dominion over northern Greece but also represents one of the earliest examples of marine engineering in history.