a river of Babylon (Abydenus); called Foja Regia, the Royal Trench or Cut (Polybius); the Royal River (Ptolemy); Almarchur (Pliny); Noarmalcha, (Amnian); a fictitious channel or cut, made by Nabuchodonosor, and a horn or branch of the Euphrates, (Abydenus). The Euphrates naturally divides into two channels, one passing through Babylon, the other through Seleucia, and then falls into the Tigris; the fictitious channel between these two is the Royal River; which mixes with the Tigris, a great deal lower down than Seleucia, at Apamea, (Ptolemy).