Disclaimer: Tolkien’s imaginarium.
“Hist, hist... he’s coming...” whispered rivulet to wavelet.
“Hold him gently as he passes...” sang the brooklet to the bourne
“Softly, softly, lead him softly...” burbled little ripples to confluence.
“Slowly, slowly, as he slumbers...” murmured balmy billows to the banks.
“Linger no, no longer linger...” whispered swashing swell to shingle.
Thus sang the many waters from cataract to watercourse, o’er undertow and ebb and flow, via dreaming doldrums’ reedy beds, through channels, around sandbars,
until the icy rill begun from snowmelt...
...became the widest waterway, washing serenely through the coastlands.
Thus did mighty Anduin bring Boromir to the sea.