Mongo is by far the planet with the most varied ecosystems. Flash Gordon gets to visit Arboria with the forest people, Frigia with its sexy Snow Queen Fria, Coralia the underwater kingdom, Tropica, Sky City with its winged Hawk Men, and the Land of Lion Men. There can never be a dull moment when you live in Mongo. Have a Hawk Man fly you to the alps of Frigia to go skiing every weekend and then have lunch in the trees of Arboria. It's weird that the ultra-campy and unrealistic Flash Gordon achieves ultra-realism in just this one way.