Mawr was a gas giant planet with seven moons that was located within the Tython system of the galaxy's Deep Core region. Mawr and Obri—another gas giant of the star system—were collectively referred to by the settlers of the Tython system as "the Giants." More than thirty-six thousand years before the Battle of Yavin, the non–Force-sensitive settlers of the planet Tython colonized Mawr's moons. By 25,793 BBY, gas-mining facilities had also been established within the atmosphere of the planet itself.
Mawr was a gas giant–type planet that was located within the Tython system of the galaxy's Deep Core region, at grid coordinates L-10. The planet occupied the tenth orbital position around its sun, Tythos, while seven moons rotated around the planet in turn. Mawr and Obri—the ninth planet of the star system and also a gas giant—were collectively referred to by the settlers of the Tython system as "the Giants."
When the non–Force-sensitive settlers of Tython—the fifth planet of the system—traveled to its neighboring worlds more than a millennium after the year 36,453 BBY, they colonized the moons of Mawr. By 25,793 BBY, gas-mining facilities within the planet's atmosphere had also been established. In that year, Ketu—a Temple Master of the mystic Je'daii Order—told the Padawan learners Harun and Resi the history of the Tython system, and mentioned the colonization of Mawr's natural satellites, amid other events.
When the Rakata Infinite Empire Invaded the Tython system, they attacked Mawr and Obri's moons, following the initial attack on Furies Gate. After capturing the giants and enslaving the inhabitants, they directed the attack against Tython, but were driven back to Ska Gora.
Mawr was first pictured in the entry for Tython in The Holonet feature of the official website for Star Wars: The Old Republic—a 2011 massively multiplayer online roleplaying game developed by BioWare. The gas giant was depicted in a schematic of the Tython system. Since its establishment in 2008, The Old Republics website has gone through a number of changes, resulting in the removal of some of the features and images that were originally located there, including the aforementioned schematic. Mawr's name and additional information on it were provided in Star Wars: Dawn of the Jedi 0, a preview issue of the Star Wars: Dawn of the Jedi series of comic books. The issue was published on February 1, 2012 and was written by John Ostrander and penciled by Jan Duursema. The planet was also mentioned in the first issue of the series, which was published on February 15 of the same year.