No it is not man made, but it has been altered by man for flood control reasons & barge traffic
Natural
One without manmade obstructions
The St. Lawrence river is 100% natural.
a sunflower
rose jasmine tulip sunflower
It's a Big Big World - 2006 Down in the Dumps Who Moved My Sunflower was released on: USA: 6 April 2006
Eiffel tower big flower
Up to the height of a house!
tributary is the collective term A tributary is a smaller stream which flows into a larger river. The name of an individual stream depends on the size of the stream. It may be a river or a creek or a canal if it is manmade.
Rio Grande is Spanish for "Big River".
Grand Lake is a natural lake but most others like Lake Mead are manmade.
The parts of a sunflower are the seeds, the pedals, the leaves, the stem and the roots.