Xi River is the name of a river in China. Xingu River is the name of a river in Brazil.
Murray River is the name of a river in Australia. Maranon River is the name of a river in Peru.
A river that begins with I is the Illinois River in Illinois USA.
River Komati River Kymijoki
One known river is the Danube.
It Joins at a confluence. That is where the river joins the larger one.
confluence
The smaller river is a tributary to the big one.
estuary
tributary is the collective term A tributary is a smaller stream which flows into a larger river. The name of an individual stream depends on the size of the stream. It may be a river or a creek or a canal if it is manmade.
Tangle Creek, Granite Creek, Sycamore Creek, Wet Bottom Creek, East Verde River, Fossil Creek and Oak Creek.
merge&center
an isthmus joins two larger bodies of land, and a tombola joins an island to a mainland. But may be flooded at high tide.
emptying, ending, exiting
It is called the River Confluence. The smaller river being a tributary to the larger river.
There are no smaller arrays. If the number of rows is smaller then the number of columns is larger and, conversely, if the number of columns is smaller then the number of rows is larger.
It usually refers to the point where a tributary joins a more major river, or where two or more meet to form a new starting point with a new name.