It is called the River Confluence. The smaller river being a tributary to the larger river.
Junction.
That is a vertex.
A corner
its called junction
A point where two rivers meet is called a confluence.
One name is obvisously "joint"
The vertex or apex
It is a derivation of the Native Indian word Tk'emlups, which means "meeting place" because the North Thompson and the South Thompson rivers meet in the dead centre of Kamloops.
The Forks got its name because of the two rivers that cross through Winnipeg. These two rivers are the Red River, and the Assiniboine River. The area where these rivers meet is where The Forks is located, as the rivers “fork” in this location.
an edge or in more simpler term "side"
The Gaelic origin word comrie means a place where rivers meet. This information was found on the online website dictionary Wikipedia. Some also use Comrie as a person's name.
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