a river system
Tributaries. Or maybe braided rivers, I can't remember.
Confluence-a point at which two or more rivers become one. Confluence- a point where tow or more rivers/streams become one.
A group of Tigers that live together are called a pack.
Horses are just called "horses" unless they are in a group together. When horses get in a group together, they are then called a "herd".
River System
A group of similar individuals living together in an area is called population.
A group of Chipmunks is called a "sweet" of Chipmunks! Isn't that cute?!
A group of raptors is called a "kettle" when they are migrating together.
they are called a team;-]
The group is called a "herd".
a group of rabbits is called a warren
A community or ecosystem.