I like to see it lap the Miles
And lick the valleys up
And stop to feed itself at tanks;
And then, prodigious, step
Around a pile of mountains
And, supercilious, peer
In shanties by the sides of roads;
And then a quarry pare
This  enjambs  with the preceeding stanza to suggest continuous movement. 
 The “pile” of mountains is an odd collective noun.
I like to see it lap the Miles 43