is a glacier.
it is the valley that the St Lawrance river flows down.
The River Nile flows through the Nile Valley.
Glacier?
Channel (Valley)
Huang he is the river that flows through china.
it could be a valley or a gorge
A Rejuvenated River
It is on the American River which flows through California's Sacramento Valley
The Nile River Valley got its name from the Nile River, which flows through the region. The ancient Egyptians called the river "H'pī" or "Iteru," meaning "great river" or "river." Over time, this name evolved into "Nile."
As no particular river or valley is specified the answer is general. In most cases NO, but it is possible.
Water flows downhill. A watercourse will always be found in a valley, assuming there is precipitaion.
There are many recognised and naturally formed features along the length of the River Thames. The valley through which it flows for example, the hills through and around where the river flows.