The word for this is confluence.
A word that can be used to join two parts of a sentence is called a conjunction. Examples include "and," "but," and "or."
self join
The two main waterways in the midwest are the Mississippi and Missouri Rivers.
To graft
When two streams join together, it is called confluence. This natural phenomenon occurs where two rivers or streams meet and merge into a larger body of water.
The waterways in Amsterdamn are called canals. The three main canals are called Herengracht, Prinsengracht, and Keizersgracht and they form belts around the city, which is called Grachtengordel.
When two pieces of material join together, it is called a seam. Seams can be created using different techniques such as stitching, welding, or adhesive bonding.
they called it shnuffeh
A Bayou.
a watermone
The seam that forms when two microcontinents join together is called a suture zone. It is a tectonic boundary where two continents have collided and their respective edges have fused together.
covalent