Read the excerpt from The Travels of Marco Polo and study the map.When the traveler leaves Kuh-banan he goes for fully eight days through a desert. . . . After these eight days he reaches a province called Tun and Kain, where there are cities and towns in plenty. It is situated on the northern borders of Persia. There is an immense plain here, in which stands the Solitary Tree, which the Christians call the Dry Tree.