it will get longer by washing over where it starts or ends, moving the soil to grow.
It is dependant on the geography of the region. Water will flow downhill until it reaches a depression or the sea.
A river can be as long as a country! For example the Mississippi River is almost as long as the U.S vertically.
The river Alt is 28kilometers long.
The Charles River is about 81mi long.
The Missouri River is 2,341 miles long and is the longest tributary to the Mississippi River.
the river nile it is 6695 km long
The River Wharfe is a river in Yorkshire, England and is 60 miles long.
The river Thames is 215 miles long, the longest is the river Severn at 220 miles long.
the river medway is 70 miles long (113km) Very long I know
The river ouse is 5 miles long
River crouch is 17.5 miles long
The Benue River Is 1400 Km Long
the missisipi river is 1,000,587,98 feet long.