December

December is a city located on the planet of No Man's Land/Gunsmoke.

History
December is one of the seven cities. Here's the orphanage where Wolfood and Livio were grown in their childhood. In the manga Wolfwood, Vash, Livio and Master Chapel had their last fight here before the came of knives in the ark for the destruction of the city and the steal of all plants. This is also the city were Wolfood died after the fight. December has been saved by vash using his power to block knives' attack

Location
December was likely located in the Southern Hemisphere of the planet, somewhere East of Octovern.

Trivia

 * Like all of the Seven Cities, December is named after a month.