Octovern

Octovern City is a manga only location and is one of the Seven Cities located on the planet, No Man's Land. After the fall of December City, Octovern became the last refuge for humanity on No Man's Land and the site of the final stand against Knives' advance.

Description
Like most cities on No Man's Land/Gunsmoke, Octovern was built around the remains of a crashed SEEDS ship and very large. Though it is not known what the exact population of the city was it was likely very large, owing to it being called one of the "Seven Cities" of No Man's Land/Gunsmoke. By the end of the War for No Man's Land/Gunsmoke it's population swelled as it was the last site of refuge for humanity on the planet.

History
Like most cities on No Man's Land/Gunsmoke, Octovern was built around the remains of a crashed SEEDS ship following "The Big Fall." Though no much is known about it before the events of the final books, Octovern hosted it's own population, the evacuated population of December City, and likely many refugees in the final weeks of the War for No Man's Land/Gunsmoke. The city was the site for the final stand humanity made to face against Knives and the Ark, yet despite the other cities on the planet falling to ruin, Octovern was mostly spared any destruction thanks to the efforts of Vash, the Earth Fleet, and their allies.

Trivia

 * Like the other Seven Cities, Octovern is named after a month, October.
 * Octovern's government seems to be run by Mayor Logram and it's city council while it's military forces are commanded by General Margetal.