Where Go the Boats?

Dark brown is the river.   
  Golden is the sand.   
It flows along for ever,   
  With trees on either hand.   
   
Green leaves a-floating,        
  Castles of the foam,   
Boats of mine a-boating—   
  Where will all come home?   
   
On goes the river   
  And out past the mill,   
Away down the valley,   
  Away down the hill.   
   
Away down the river,   
  A hundred miles or more,   
Other little children   
  Shall bring my boats ashore.