Ark

Ark is a name given to two massive Forerunner installations, both designed with the primary purpose of manufacturing Halo rings. Situated outside the Milky Way galaxy, they also served as Lifeworker research facilities, as well as conservational preserves for the numerous species of the galaxy, preserved by the Forerunners during the Conservation Measure. The Arks were shaped like massive flowers, consisting of several curved arms, similar to the petals of a flower, surrounding a circular Halo construction foundry in the center.

Two Arks existed during the Forerunner-Flood war; the greater Ark, which produced the original array of Halos 30,000 kilometers in diameter, and Installation 00 or the lesser Ark, which produced a newer series of rings each 10,000 kilometers in diameter. Both of these constructs are known to have been distinctly referred to as "the Ark"; originally, the term was more commonly applied to the greater Ark, whereas the lesser Ark and its newer, more efficient array of Halos was kept a well-guarded secret among Forerunners. With the greater Ark destroyed in the final days of the Flood war, the lesser Ark remains as the only Ark installation and is as such commonly known as "the Ark".

List of appearances

 * Halo: Combat Evolved
 * Halo: Combat Evolved Anniversary
 * Terminals
 * Halo: First Strike
 * Petra
 * Halo 2
 * Halo Graphic Novel
 * Second Sunrise Over New Mombasa
 * Halo 3
 * Halo Legends
 * Origins
 * Halo: Cryptum
 * Halo: Primordium
 * Halo: The Thursday War
 * Halo 4
 * Terminals
 * Halo: Silentium
 * Halo: Rebirth