The River

I have a body but I have
No legs, head or arms.
I give life but 
I am not alive.
I’ve see the world and
Now I'm here.
Beings live inside me but I
Am not a house or a tree.
I’m a part of the water cycle 
I bring the water up and down
And all around the mountain
I’m changeable but unchanged.
I’m a running river long 
I have existed for hundreds of years
Each year I live I get longer and 
Longer maybe forever I will grow