Tributaries.
A tributary
Small contributors to a big river are often referred to as "tributaries." These smaller streams or rivers flow into a larger river, contributing to its water flow and drainage basin. Together, tributaries and the main river form a river system, which plays a crucial role in the ecosystem and hydrology of the region.
They join together; Many small streams becomes on big one and the big ones lead to the river
Feather River College's motto is 'Small school, Big Education'.
Rio Grande
why are you
It Joins at a confluence. That is where the river joins the larger one.
They are called characatures
I'm guessing that the White Nile is called the big long river because it is the longest out of the other one, the Blue Nile. However, the Blue Nile provides roughly 2/3 of the Nile's water supply.
the small one is called tabala and the big one is called dhaga
56m above sea level
the biggest is the nile river in Africa Egypt