Iraq mainly consists of desert, but near the two major rivers (Euphrates and Tigris) are fertile alluvial plains, as the rivers carry about of silt annually to the delta. The north of the country is mostly composed of mountains; the highest point being at point, unnamed on the map opposite, but known locally as Cheekah Dar (black tent). Iraq has a small coastline measuring along the Persian Gulf. Close to the coast and along the Shatt al-Arab (known as "arvandrūd": اروندرود among Iranians) there used to be marshlands, but many were drained in the 1990s.