A map published by the National Geographic Society shows a much smaller Kumtag. This is a rectangle with a northwest corner south of Lop Nor, a southern edge along the Altyn-Tagh and an eastern edge just beyond the Gansu border. Near the northeast corner is the Jade Gate which is often taken as the western end of the Great Wall. From space it appears as a belt of orange sand dunes. This is probably the 2500 square kilometer area mentioned below.