From Gineipaedia, the Legend of Galactic Heroes wiki
El Facil (Japanese: エル・ファシル) was a planet of the former Free Planets Alliance which was briefly conquered by the Galactic Empire in the Battle of El Facil in 788 UC (479 IC / 3588 CE), during the Alliance–Imperial War. Prior to the invasion, the Alliance military forces, under the command of Arthur Lynch, that were supposed to have protected the planet fled, leaving the evacuation effort to a young, newly commissioned officer, Yang Wen-li.
Yang was able to successfully evacuate more than 3 million civilians from El Facil before the Imperial forces landed, including the woman who would later become his wife, Frederica Greenhill. For his efforts, Yang became a hero of the Free Planets Alliance.
The name El Facil is likely derived from Al-Fashir, a city in the Darfur region of western Sudan.
The DVD features show the main city on the northern edge of a southward facing bay on the northern continent.