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Navigable aqueducts (sometimes called water bridges) are bridge structures that carry navigable waterway canals over other rivers, valleys, railways or roads. They are primarily distinguished by their size, carrying a larger cross-section of water than most water-supply aqueducts. Although Roman aqueducts were sometimes used for transport, aqueducts were not generally used until the 17th century when the problems of summit level canals had been solved and modern canal systems started to appear. The 662-metre long steel Briare aqueduct carrying the Canal latéral à la Loire over the River Loire was built in 1896, and remained the longest navigable aqueduct in the world until the 21st century, when the Magdeburg Water Bridge in Germany took the title.
Aquaduct la Chaise, canal du Nivernais
Aquaduct la Chaise, canal du Nivernais