Gavmishan Bridge

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Gavmishan Bridge is a historic bridge in Darreh Shahr County, Ilam Province, Iran. The bridge was built in the late Sasanian era on Karkheh River, parts of which constitute the modern-day border of Ilam and Lorestan provinces. It is 175 m (574 ft) in length and about 8 m (26 ft) in width. It has the longest arch span among the ancient bridges in Iran and the world. Many experts consider it an engineering feat, considering the time when it was built, the material used and the floods it has withstood during its age of 1,400 years. It is believed that the bridge was intentionally destroyed by the Persian army to stop or slow down the invasion of Arabs during the Muslim Conquest of Persia in the 7th century.