The eighth-floor region where Carl and Donut got stuck and built their deck.
Cuba is where Carl and Princess Donut got stuck on the eighth floor — Quasar calls it "a place called Cuba", the phrasing of an alien lawyer who knows Earth geography only through the show.
It is where they collected the cards that defined their run: the seal, Raul the crab, the giant terrifying cat, the donkey-snake, Uzi Jesus and Asojano who were combined into Lazarus, and Alpha Carl. It is also where the party gathered the Cuban allies who did not survive the floor, Paz among them.
Not described in the recap; a dungeon-floor recreation of the Earth island, treated by the audience as one of the floor's named regions.
The eighth-floor region that produced Carl and Donut's deck and most of their casualties.