The Jiu Menkou Wall is part of the Great Wall built in the Ming Dynasty (1368-1644)  five hundred years ago. This section is the only part of the Great Wall built over water.  It runs from the foot of Mount Hongluo to the top of the mountain, turning north first, and then creeping eastward along the mountain ridge.  The Daqinghe River flows through the nine gates of Jiu Menkou, which means "nine gates" in Chinese.  In the past, the Jiu Menkou Great Wall served as a gateway between the northeast and other parts of northern China.  Its strategic position made it the site of many fierce battles over the centuries.  It is in very good condition and has a tower with a view of the sea.