|There is more information available on this subject at Orion Arm on the English Wikipedia.|
The Orion Arm is a spiral escalation of a minor spiral arm in the Milky Way galaxy; it is located near the galactic core and is part of the Sagittarius Arm (a major arm). The Sol System and Earth are within and amid the Orion Arm. It is also referred to as the Local Arm, Local Spur, or the Orion Spur. It is named "Orion" due to its proximity to the Orion Constellation.
The Covenant's area of inhabitants also includes a large portion of the Orion Arm.