Like an alluvial plain, right?
An area made up of silt deposited by a river? ? ?
Yep. For example, the Nile Delta is an alluvial plain. Other alluvial plains, such as some in the desert near to here (inland SoCal), do not have a river per se as their source, but are formed by sediment carried from multiple gullies, washes and rivulets in the wet season.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.