Fort Abandon is a rundown New California Republic fort located in an unknown area of the American southwest. The railway has a crossroads here. It was originally called Fort Aradesh, and was a major fortification. However, Caesar's Legion attempted to destroy NCR's presence in the east, and actually succeeded in destroying the fort. The name changed after NCR's control of the frontier receded.
Fort Abandon did not appear in any of the published games, but was to appear in the canceled Fallout 3 project by Black Isle codenamed Van Buren. If the player so chose, he could slowly upgrade the fort into a center of prosperity.
Fort Abandon is mentioned by Ulysses in the Fallout: New Vegas DLC Lonesome Road. He initially calls it "Fort Aradesh," then corrects himself, calling it "Fort Abandon."