Endor (also known as the Forest Moon of Endor and the Sanctuary Moon) was a small forested moon orbiting the gas giant planet of Endor and was the farthest moon away from it. An enchanted world, Endor was notable for being the native home of the Ewoks, and being the location of the Battle of Endor, which would result in the downfall of the Empire and the first death of the Emperor Palpatine. Due to its proximity to the inhospitable Unknown Regions, Endor was a relatively quiet planetoid both prior to and after the battle. Endor was also known for the vast amount of sentient species it supported, from baseline to exotic. This was largely due to the unusually large number of shipwrecks Endor experienced; it has been compared to a "desert island" in space.
Around 3,645 BBY, the Republic had set-up a secret bio-lab on the moon. The moon's history was constantly being shaped by starships crashing on the backwater satellite, introducing new species and technology which had to be integrated into the local politics and ecosystem. Known crashes included Sickly Tremor prior to 1100 BBY (introducing Phlogs and Gorax), a Starhunter menagerie ark in about 800 BBY (introducing Gupins, Teeks, and tree goat), the Free Enterprise in 130 BBY (introducing Jindas and Tulgahs), a stolen ship in 100 BBY (introducing Sanyassan Marauders and the witch Charal), Noa Briqualon's starship in 26 BBY (carrying Noa Briqualon and Salek Weet), and the Towani family's starcruiser in 3 ABY (carrying Cindel Towani and her family).
Endor was set aside as a protected nature reserve during the Galactic Republic, giving it the name Sanctuary Moon. Few spacers had ever heard of Endor, let alone visited the moon. Of those who had, there were two types: those who continued on their way, not wanting to waste their time on such an unimportant puffball of a moon and those who had crash-landed in the forests due to the stellar anomalies, such as the Endor Gate black hole, in the area. These travelers were forced to scrabble for food and shelter along with the natives.
As ships disappeared in the region, the Endor moon earned a reputation as a "desert island in space," and was usually given a wide berth.
The moon did have a Ffib outpost established before the Clone Wars. During the Clone Wars, it had a Separatist base, discovered by Aayla Secura.