the place where two rivers flow together and become one .(Oxford)
2.the fact of two or more things becoming one (Oxford)
a situation in which two things join or come together (Cambridge)
The confluence of the Blue Nile and the White Nile .(Oxford)
The change has been brought on by a confluence of factors.(Cambridge)
confluence of the Blue Nile and the White Nile
confluence of factors
Assemblage
Junction
Division
Separation
Confluence