The Haven System was the primary system of the Republic of Haven, which contained the capital planet of Haven.
It was located 667 light years from Earth and almost three hundred light-years from Manticore. (HH1, HH3)
The Proctor Shipyards, comprised of three separate shipyards, Proctor One, Two and Three, were among the largest shipyards in the entire Republic. (HH9)
The Haven System was guarded by the Capital Fleet. (HH8)
The planet Haven itself was guarded by a number of heavily armored orbital forts, including Liberty, Equality, and Fraternity. (HHA1.3: AWoG)