Elba II is the location of a Federation penal colony, governed by Donald Cory. Its atmosphere toxic, the colony is surrounded by a pressure dome. Additionally the colony utilitzes a force field to prevent beaming that could not be breached by the Enterprise's phasers.
Fleet Captain Garth of Izar was an inmate at Elba II. (TOS: "Whom Gods Destroy")
- Elba II was named after the island of Napolean I's first exile.