The simple answer is downhill. Where a river is tidal it will be prevented from reaching the sea at high tide and will fill, being released as the tide falls. In steeper areas of the course of a river there may be rapids or catatacts. In larger rivers in lowland areas there may be meandering.
time passes
It rotates.
They are eroded by the weather.
Time passes.
digested into simple sugars
The river that passes through the Eternal City is the Tiber River.
The North Platte river passes through the city of Casper.
Garonne River
what river that passes through zaragoza?
Mississippi River
the colorodo river
The Jordan river.