classic waka stream

on Tatsuta River
maple leaves drift with the flow—
in the sacred hills
of Mimuro, high among the gods,
showers must be falling now

Meaning
Maple leaves drift along the Tatsuta River—surely in the sacred Mimuro mountains upstream, the autumn showers are falling.
Commentary
Book Five Autumn Poems (Part Two)

A note records that the first two lines are also given as “On Asuka River, maple leaves drift.”

At the time, it was believed that passing showers (shigure) caused the trees to redden and their leaves to fall.

“Kaminabi” refers to a place where a deity resides, and “Mimuro” signifies a sacred dwelling, either of a noble person or of a god. “Mount Mimuro” here likely refers not to a specific mountain but to a sacred, divine mountain in general.
Author
Unknown Poet
Source
Kokin Wakashu
Other