Utamakura

"poem pillow" (歌枕) is a rhetorical concept in Japanese poetry.

Definition
is a category of poetic words, often involving place names, that allow for greater allusions and intertextuality across Japanese poems.

enables poets to express ideas and themes concisely—thus allowing them to stay in the confines of strict structures. Some scholars see the use of geographical allusion as the evidence for a restricted scope of poetry writing. Although the poets' "true" meaning was true because the essence was initially pre-established, the poems were written within fixed topics. The poet could inhabit a subjective position or persona and write about the topic, but not necessarily about their personal feelings; therefore, could have restrained the scope of topics a poet could write about.

include locations familiar to the court of ancient Japan, such as:
 * particularly sacred Shinto and Buddhist sites,
 * places where historic events occurred, and
 * places that trigger a separate mental association through a pun.

Aesthetic function
serve as a significant tool to achieve (mystery and depth) in Japanese poetry by adding profound and indirect beauty in poems. It can be used as a source for identifying significant figures and places in ancient Japan.

History
The history of is found in documents on the study of poetry such as the  of Noin, by the poet and monk of the late Heian period, and lists of places in the  (Utamakura reference book).

were first used by traveling priests. They collected stories from the towns they traveled to. Since they saw many places, it was easier to remember the details of a story by using a single, consistent reference point for each recurring event in their tales. Over time, the people across the Japan came to identify place names by the psychological feelings associated with the references made by the wandering priests.

After place names and people had become well established, eager  poets went sightseeing to the sites of. Beyond becoming familiar with the scenery of the poems, entering the locale of a poem or story deepened one's understanding of it.

was also used in, a form of Japanese collaborative poetry that is the ancestor of and haiku poetry.

Examples
There are numerous instances of in Japanese literature, one of which is the. The source of this particular example is poem #3 in the "Spring" section.

In the poem above, Yoshino refers to a place in the Yamato region in the nearby of the capital. Yoshino is known for having both heavy snowfall and an abundance of cherry blossoms.

Poem #1 in "Spring 1" of Shin Kokin Wakashū also uses Yoshino for depicting the beginning of spring.

Another instance of poetic place name comes from Tales of Ise, a piece titled "In the Provinces" (#15).

Mount Shinobu is a pun on the verb shinobu, meaning "to conceal," "endure," "long for," and "remember".

Contemporary examples
Utamakura are also used outside of poetry, for example menu items named after their visual appearance with a reference to a well-known Japanese scenic area. Tatsuta age, deep-fried fish or chicken that has a dark reddish-brown color as a result of being marinated in soy sauce, is named after the Tatsuta River, known for its maple trees, the leaves of which turn a deep red color in autumn.