I am referring to this early Persian Period map. Let us begin with the River of Babylon. This is shown coming out of the mountains of Urartu, and is almost certainly the Euphrates. It is unlikely the Euphrates is the Tigris and Euphrates combined-Der, for example, is as far as I know, only identified by the Mesopotamians with the Der near Elam, just N. of settled Badrah. The Bitter River is completely outside and beyond all land, which is not true of the Tigris-Euphrates rivers, and is probably parallel to the Bitter (southern) Sea Bit Yakin, the capital of Chaldea, was said to have been located on. Khabban, which cannot be al-Habbaniyah under the “Bitter River=Tigris/Euphrates” option, can easily be so under the “Bitter River=Legendary Surrounding Sea” option. The Channel Swamp is, therefore, marshes of Iraq, and the larger southern island is the one on which Basra is currently located. The small bitter river branching off from the Euphrates to join the larger Bitter River is, therefore, the Lagash branch of the Euphrates and Shatt al-Arab. By using this reconstruction, Bit Yakin of Sealand should be located between the northern reaches of the marshes and the Urite branch of the Euphrates.