The Aelu River is a significant waterway located north of a battlefield where the Lion Clan engaged the Unicorn Clan. This river is associated with a recent conflict in which the Lion forces, led by General Akodo Sakawan, defeated the Unicorn, capturing several of their warriors. The opposing general, Shinju, managed to escape.
The river's vicinity to military engagements highlights its role as a geographical marker in the ongoing tensions between the Lion and Unicorn Clans, as well as the Lion and Crane Clans. The historical context includes a seven-year peace deal between the Lion and Crane Clans, following the burning of the Crane embassy in Otosan Uchi. The Aelu River serves as a critical landmark in understanding the dynamics of power and conflict among the clans in the year 1123.