classic waka stream

涙川その水上を尋ぬれば
世の憂き目より出づるなりけり
Roma-ji

Namidagawa sono minakami o tazunureba yo no ukime yori izuru narikeri

English Translation
The River of Tears —
when I go in search of where
its waters rise,
I find they flow from the hard
and bitter eyes of this world
Meaning
When I traced the River of Tears back to its source, I found it springs from the bitter trials of this world.
Commentary
Book Ten Miscellaneous Poems II 368

Likening his flowing tears to a river, the poet traces it to its source and finds that it springs from the bitter trials of the world. The conceit lies in pressing the image of tears as a river and seeking its source in the sorrows of the world.
The next poem, 369, likens the heart to water, so poems comparing tears and the heart to flowing water stand side by side.

The first line, "namidagawa" (River of Tears), likens flowing tears to a river.
The second line, "sono minakami o," refers to the river's upper reaches, its source.
The third line, "tazunureba," is a conditional of certainty: when I trace it.
The fourth line, "yo no ukime yori," means from the bitter trials of the world; "me" (eye) also resonates as the place tears come from.
The final line, "izuru narikeri," combines the copula "nari" and exclamatory "keri": that is where it flows from.
Source
Shika Wakashu
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