Today a nice response from Jenny made me go back to Alice Oswald’s wondrous book-long poem Dart (2002). Dart is the narrative of a river, tracking its life from source to sea, its a beautiful project, and you can read more about its genesis here.
Here are some lines from the actual poem, just to give you the taste of it:
one step-width water
of linked stones
trills in the stones
glides in the trills
eels in the glides
in each eel a fingerwidth of sea