From The Stargate Omnipedia
For other uses of this name, see Othalla (disambiguation)
The Asgard home galaxy, where the planets Halla and Orilla are located. "Othalla" is also the name of an Asgard world in the Ida Galaxy. A modified cargo ship can reach the Othalla Galaxy in roughly 10 days.
See also: Planets - Othalla
Unnatural Selection - With Thor's help, SG-1 and Prometheus cross into the Othalla galaxy in the hopes of investigating the latest Replicator threat.
New Order, Part 1 - Carter and Teal'c take O'Neill's modified cargo ship back to the Othalla galaxy to hopefully obtain the aid of the Asgard.
New Order, Part 2 - SG-1 helps the Asgard defend Orilla from a Replicator infestation.
Unending - The Asgard commit mass suicide to end their civilization and protect their technology from falling into the wrong hands, destroying the planet Orilla.