Flanking the Seine: Clues

TWO CLUES:

For the Left Bank: We guard the river front and true
as you walk by, we are watching you.
Just look up a little bit
and you will find us where we sit. 

and

For the Right Bank:
If you stand at the Avenue du General Lemonnier
At its intersection with the Quai des Tuileries
You will find a majestic sphinge guarding the way
Between the Louvre and Le Notre’s squared trees.