Use the map below to answer the following question: a map of the great wall of china of qin dynasty. the red lines indicate the qin era wall and stretch from the northern shore of the yellow sea west into the gobi desert and mountainous regions south of the gobi desert. the yellow line indicates the current border of china. it lies to the north of the red line and stretches from the right to left border of the map. © 2012 ksyrie creative commons, attribution-share alike 3.0 unported the red lines represent improvements made to a large structure by the qin dynasty. what was the structure? great wall of china forbidden city yellow river dams mandarin palace