Enki was a planet in the People's Republic of Haven, the sole habitable world of the Barnett System.
A huge Havenite Navy station called DuQuesne Base with a personnel of about one million people was located on the planet. (HH3)
It was conquered by the Manticoran Alliance's Eighth Fleet in 1915 PD during Operation Buttercup, and regained by the Havenite Navy in 1919 PD during Operation Thunderbolt. (HH9, HH10, HH11)