中国故宫护城河美景 beautiful scenery of the moat of the forbidden city of china

3840 540000 average away beautiful beijing capacity china circumference city commonly corner cubic depth dynasty early excavated forbidden known meters ming moat more revetment river scenery solid steep stone storage than tongzi wall was water width years yongle 北京故宫护城河俗称筒子河开挖于明朝永乐初年距城墙20米条石叠砌驳岸坚固陡直宽52米水深5米周长约三千八百四十米平均蓄水量逾54万立方米n