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They can be 'navigated'
because the rivers are more deep and wide so they can erode more
1 mile 2 ft deep
A waterway deep and wide enough for a vessel is called navigable.
Deep and wide enough for boats to travel and trade more recourses
Not deep enough, not wide enough, doesn't run through any major freight hubs.
Deep and wide enough for boats to travel and trade more recourses
Deep and wide enough for boats to travel and trade more recourses
is a thing
I think the rivers are to wide
This would be called a "sigh" breath.
what do people build to cross deep rivers or valleys?