What is the ecological concept of a watershed?

Question

I hate Biology...

Answer 1

Simply put, the watershed is the land regions that water uses to collect and drain. Also called the drainage basin.

Rivers and lakes are parts of the North American watershed.

Answer 2

I am kind of lost in the question. A watershed usually is an ecosystem where water, typically from rivers and streams, drain into the same body of water, of some sort. I really dont know what "ecological concept" you are talking about. I mean everything in the watershed must use the same body of water therefore tying all of the organisms together in the ecosystem.