peteroh9 t1_j141bpy wrote
Reply to comment by Initial_E in When this bridge in Fort Benton, Montana, USA was built 1888 it was required to have a swing span to allow steamboats to navigate. It was considered the furthest navigable point on Earth, more than 2,700 miles from the Gulf of Mexico. by triviafrenzy
Canals are manmade and it's just worded poorly.
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