The Erinin is one of the longest rivers in the main continent, originating in the Spine of the World close to the Niamh passes and running west along the southern border of Shienar and Arafel before turning south (Reference: Map). It splits near to Dragonmount, with the island of Tar Valon in the center. The eastern branch, the Esendrelle Erinin has the villages Luagde, Daghain and Osenrein and the western branch, the Alindrelle Erinin, with the villages of Jualdhe, Darein and Alindaer. Each village has a bridge crossing to the city (Reference: TWoRJTWoT, Ch. 24).
It continues south along the Cairhienin border and then the border between Cairhein and Andor before passing between Aringill and Maerone on opposite banks, eventually heading to Tear and ending in the Delta known as the fingers of the Dragon. South of Maerone, there are very few villages along the banks (LoC, Ch. 6). Other towns include Jurene (TDR, Ch. 39).
Tributaries include the Mora, which runs along the border between Arafel and Shienar and joins the Erinin at the southern border, the Alguenya which passes through Cairhien and joins the Erinin at Aringill and the Luan, which joins west of Caralain Grass and north of Braem Wood.