The Harbor focuses a city's maritime trade and naval power. For this reason, unlike in prior Civilization titles, a city does not need to be founded on the coastline to establish naval dominance (as long as a coastal tile lies within three tiles of the City Center district). Requires the Celestial Navigation technology.
A Harbor allows naval units to be built within the city even if the City Center is not located on the coastline. Naval units will spawn within the harbor. Unlike in Civilization V, naval units gain bonus EXP from maritime buildings in the Harbor, rather than conventional military buildings such as Barracks.
The following buildings can be constructed in a Harbor: