Deep Lake

Deep Lake is a castle in Game of Thrones. It is located on the western portion of the Wall and was raised by the Night's Watch to replace the the larger and more expensive Nightfort. It is not manned by the order at the time of the series.

In the books
In the Song of Ice and Fire novels Deep Lake was first built during the reign of Jaehaerys I as a smaller, cheaper replacement for the Nightfort. Queen Alysanne Targaryen convinced the Night's Watch to replace the older castle. Deep Lake was paid for by Queen Alysanne and built by the men that her husband Jaehaerys I, sent north. To the east of Deep Lake sits Queensgate.