BAGHDAD — Many islands in the Euphrates River in Anbar province have been or still are under the control of the Islamic State (IS).
These islands have been a haven for IS guerrillas, who use them for military mobilization. Controlling the islands allows IS fighters to dominate the eastern side of the river, which is connected to vast desert areas stretching from Mosul to Anbar all the way to Syria. The eastern side of the river in Anbar is generally sparsely populated.