The Anchorages are a series of six colony worlds established by the government of Nova Prime.
Lycia - First
Olympus - Second
Asgard - Third
Avalon - Fourth
Iphitos - Fifth
Heliopolis - Sixth
The anchorages are located within the Sagittarius Arm (also called "The Carina) of the milky way. They are further away than the distance that Nova Prime is from earth, but they are connected via for of wormhole space link.
The Anchorages were founded after the initial invasion of the Skrel, they serve as a sort of "safety valve" for humanity in the event of a Skrel takeover of Nova Prime.