Karifa

"If the Global Allied Fleet moves to suppress Paradis... they'll have to gather first in this naval port of Acirfa. [. . .] A nation that loses its warships will be brought to financial collapse. I think this attack will be more than enough if we're able to do just that to every major nation."

- Yelena ascertains Acirfa's value as a target to Eren Yeager

Acirfa (カリファ) was a Marleyan naval port located on the continental mainland's northern coast.

War for Paradis arc
Upon arriving in Odiha, Yelena confesses to discussing a strategy with Eren Yeager to cripple Marley's military defenses with a partial rumbling in order to secure peace for Paradis Island for several decades to come. She had singled out Acirfa as the likely gathering point for a Global Allied Fleet which would inevitably be summoned after Eren's planned raid on Liberio. Despite her guarantee of a temporary peace with a strike against Acirfa, she had shown some concern regarding Fort Salta in southern Marley. With Eren leading a full-scale rumbling against the entire world, Yelena guesses that after destroying Acirfa, he would target Fort Salta in order to completely rid Marley of any weapons against the Founding Titan.

Trivia

 * Unlike the majority of Marleyan location names which are based in Latin or Italian nomenclature, "Acirfa" simply appears to be "Africa" backwards. This is also applicable to the original katakana in which the characters for Africa (アフリカ) are reversed. This may refer to the Marleyan continental mainland being based on the real-world continent of mirrored vertically.
 * If mirrored vertically, Acirfa's location according to Yelena appears to correspond roughly with in.

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Califa Acirfa