Read the excerpt from chapter 8 of the travels of marco polo and study the map.
the city stands at the mouth or entrance of the gulf of kalhat, so that no ship can enter or leave the gulf except by leave of its rulers. the malik of this city thus has a powerful hold over the sultan of kerman, to whom he is subject. for sometimes the sultan imposes some due on the malik of hormuz or one of his brethren, and they refuse to pay it, and the sultan sends an army to enforce payment.
how does the map the reader understand the passage?