Fred walked along a riverbasin
we went across a river
you can use the word across in a sentence by saying i went across the river in a tube.
The playtpus swam in the river.
He moved to a highland far from the river.
We hiked inland, searching for a river.
I swam across the river yesterday.
The surface of the river glinted in the moonlight.
They watched as the campers pushed their canoes into the river.
Matilda splashed cool water from the basin onto her face.
It it a noun. Use it this way: I saw anibis drinking from the River Nile
that is what is called a basin
If you have seen a river split into the ocean then you have seen a DELTA!