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This image shows a section of the sophisticated wastewater and drainage system at Persepolis, dating back to the Achaemenid era (c. 6th century BCE). Carved directly into the rock foundation of the terrace, this complex network of subterranean canals was a dual-purpose engineering feat. It was designed to handle sewage from the palaces and, crucially, to divert the heavy seasonal rainwater runoff from the adjacent Rahmat Mountain, protecting the monumental structures from flooding. This system is a testament to the advanced understanding of hydraulics and urban infrastructure in ancient Persia.