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The Gobi is the fifth-largest desert in the world, covering roughly 500,000 square miles (1,295,000 square kilometers). While most of the world might think of the Gobi Desert as a single entity, people within Mongolia recognize thirty-three different gobis, or gov , as they are called in Mongolian. These gov are relatively flat areas, covered with sand or gravel of varying sizes, most trending east-west, and separated from each other by ridges of shale, granite, basalt, and other up-thrusting rocks. On our trip south from Bayan Tooroi we will pass through four govs. Zakhyn Us, where we started, is in the Zakhui Zartyn Gov, a flat area between the main crest of the Gov-Altai Mountains and the Edrin Mountains to the south. Crossing the Edrin Mountains we passed into the Edrin Gov. Much of this is classic zag desert—gravel flats covering with miniature forests of zag (saxaul bushes =  Haloxylon ammodendron ) The barren gravel flats of the northern edge of the Edrin Gov with Eej Khaikhan