Tivus

From Wikitroid, the Metroid wiki

Tivus was the last location the GFS Valhalla visited before it was attacked by Space Pirates. During the Federation assault on Phaaze, it is revealed that Tivus was also the last place the GFS Olympus visited before the assault.

Planets in the Metroid Series
Note: Bolded Planets were visited by Samus Aran
Tetra Galaxy
Alinos | Arcterra
Ooromine System
Bilium | Ooromine II | Twin Tabula | Zebes | Tallon IV
Federation Solar System
Bryyo | Norion | Elysia
SR 388 System
SR388 | UCB 1
Other
Aether | Aliehs III | Bes III | Cylosis | Daiban | Earth | Jiglard | Jovia XII
Earth Colony K-2L | Mondreus | Phaaze | Phrygis | Pirate Homeworld | Tivus | Vho | Wotan VII