From A Wiki of Ice and Fire
The Rhoyne is one of the main rivers of the eastern continent, Essos.
The Rhoyne originates from the conjunction of two of its tributaries, the Upper Rhoyne and the Little Rhoyne, southeast of the ruins of Ghoyan Drohe in northwestern Essos. Its course runs southeast and meets the Noyne just north of Ny Sar. The Rhoyne continues southeast to Dagger Lake, where it is joined by the Qhoyne. After Dagger Lake, the Rhoyne runs south, with the Golden Fields along its western bank. The Rhoyne continues south, with the Lhorulu flowing into it at the Sorrows and the Selhoru connecting at Selhorys.
It is said the southern Rhoyne becomes so wide that someone in its centre cannot see its shores. The Volaena reaches the Rhoyne just north of Volantis. A giant delta forms at its mouth, upon which Volantis sits along the Summer Sea. The Long Bridge crosses the Rhoyne in Volantis.
The river's banks are the homeland of the Rhoynar, a river-faring people. Seven hundred years before Aegon's Landing in Westeros, the Rhoynar were defeated by the Valyrian Freehold. Queen Nymeria led the surviving Rhoynar in ten thousand ships from their homeland to Dorne in Westeros. Consequently, there are few Rhoynar living along the river's banks. Among them the river holds a god-like status; in their faith it is called "Mother Rhoyne".
|“||On the river there had been wonders to behold: giant turtles, ruined cities, stone men, naked septas. One never knew what might be lurking around the next bend.||”|
- Tyrion, missing the river Rhoyne