Iwabashiru taki mo todoro ni naku semi no koe o shi kikeba miyako shi omōyu

石走る滝もとどろに鳴く蝉の
声をし聞けば都し思ほゆ

Roma-ji: Iwabashiru taki mo todoro ni naku semi no koe o shi kikeba miyako shi omōyu
English Translation: Rushing over rocks
the falls roar, and louder still
the cicadas cry;
when I hear their voices
the capital comes to mind
Meaning: When I hear the cicadas crying so loud they drown out the roar of the falls rushing over the rocks, my thoughts turn to the capital.
Commentary: Book Fifteen Poems of the Envoys to Silla 3617

Headnote: "Five poems composed while anchored by the rocky shore of Nagato Island in Aki Province"
Hearing cicadas crying so loud they rival the roar of the falls, he is reminded of the capital. The fierce shrilling of cicadas on the island in high summer calls up the cicadas he heard in the capital, stirring his longing for home. The shift from the description of a powerful sound to quiet homesickness well conveys the heart of a traveler.
The author, Ōishi no Minomaro, was a member of the embassy to Silla, but nothing further is known of his rank or office.
According to the headnote, this is one of five poems composed while anchored by the rocky shore of Nagato Island in Aki Province, thought to be present-day Kurahashi Island in Kure, Hiroshima Prefecture. A left note reads "the above poem is by Ōishi no Minomaro."

First line, "iwabashiru": rushing violently over rocks, also used as a pillow word for "taki" (falls).
Second line, "taki mo todoro ni": "todoro ni" describes a resounding sound: so loud that even the falls seem to roar, a comparison expressing the intensity of the cicadas' voices.
Third line, "naku semi no": summer cicadas shrilling in the island's mountain valleys.
Fourth line, "koe o shi kikeba": "shi" is an emphatic particle; when I hear their voices, a definite condition with the realis plus "ba."
Fifth line, "miyako shi omōyu": "shi" is emphatic and "omohoyu" means to come to mind of itself: the capital comes to mind.
Author: Ōishi no Minomaro
Source: Manyoshu
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