From the Strange Maps blog. Much of the action in the comic strip (and later movies) starring Flash Gordon take place on the fictional planet Mongo. This planet is divided in several realms, such as: Arboria: a forest principality, governed by prince Barin. Frigia: a frozen kingdom, ruled over by queen Fria, cousin to Barin. Coralia: an underwater kingdom beneath the Sea of Mystery, east of Arboria, ruled by queen Undina. the Land of the Lion Men: also bordering the Sea of Mystery, ruled by king Thun. the Sky City of the Hawk Men: north of the Magnetic Mountains, led by king Vultan.