Amazonia & the Lost World 

The secret island of Amazonia is  located in the Bermuda Triangle. Once a month it  acts as a dimensional gateway between  Earth and a parallel world called the Lost World.  For one week a month (three days prior to, the day of, and three days following the full moon) Amazonia exists in our world, the rest of the time it exists solely in the Lost World.  

The Amazons are unaware that their island exists in two different worlds. They do know that  for one week a month the constellations  appear different. This week is considered a holy time to them. It is also the time when Amazons who are of age engage in their mating rituals. The rituals are essential to Amazonian survival since they cannot give birth to male children. The ritual involves  involves boating to Bermuda (the closest populated land mass while in our world) to mate with the male population and is considered a rite of passage. A number of mating rituals are performed to insure pregnancy before returning to Amazonia.  Typically, Amazons only do this once in their life, on their 25th birthday, however, they may make future trips if pregnancy did not occur on their initial visit. A "relationship" is forbidden in Amazon culture, and so there is no such thing as marriage. Sex is simply a tool for procreation, no Amazon would admit to it being pleasurable. They are very primitive in nature, but build themselves temples and homes. Amazons are not immortal, though they are extremely tall with above average physical attributes.

The Lost World is a world in which dinosaurs never died out and continue to exist . It is also home to mastodons, saber-toothed tigers, and a wild variety of pre-historic beast that should not share the same time period or climate as dinosaurs. Various tribes of primitive humans live in the jungles, surviving as best they can in the savage environment. The tribes have  been able to domesticate some of the beasts for food and mounts, thus helping them from being driven out of existence by dinosaurs and other threats.