箭扣长城往东是这里保存量完好的城楼——正北楼，它是慕田峪长城的至高点。
The eastern part of Jian Kou Great Wall-North Building is well preserved at here.
然而，他并不知道，黄花城长城和箭扣长城之间实际相距约30公里，两者之间已经残破不堪，有些地方甚至断开，无法通行。
However, he did not know, Huanghuacheng Great Wall and the actual Jiankou Great Wall between about 30 km apart, have between dilapidated, and in some places even 32, impassable.
箭扣长城明初建关，海拔1000余米，以雄伟险峻而著称。
Jian Kou Great Wall built in Ming dynasty. about 1000 meters above sea level.
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