Riverlong

Riverlong is a term that can refer to an exceptionally long river in real-world geography, or to a fictional river used in literature, world-building, and media. Unlike a standardized geographic name, riverlong functions primarily as a descriptive label or as a proper noun in fiction, rather than as an officially recognized hydrological feature.

In usage, riverlong is built from the words river and long, signaling a watercourse of considerable length. When used descriptively, it may accompany measurements or comparisons to illustrate scale, but it lacks a fixed length threshold in formal geography.

Geography and hydrology: In fictional or hypothetical settings, Riverlong is imagined as a transregional river spanning multiple climates and landscapes, with a broad floodplain, various tributaries, and a watershed that shapes human settlement, agriculture, and trade. Real-world analogs of the concept include the Nile, Yangtze, or Amazon, though "riverlong" is not an official name for any of them.

Cultural and literary usage: Riverlong also appears in novels, games, and speculative essays to evoke a journey, endurance, or the passage of time. Authors may assign mythical or symbolic meanings to the river, such as thresholds between regions or eras.