- The Great Desert
- Tropical Outbacks
- Rosebush City
- Thorn Valley
- The Great Forest
The genetically engineered rodents that escaped from NIMH in the 21st century hid for more than a century. In 2156, the rodents stole an United Earth NX-class starship from drydock. They escaped the heavy fire and crashlanded on the planet that would become known as Ratnia. The NX wreck is still prominent today.
The rodents built their own cities, and by the time Voyager landed on the planet, they were at a medieval stage of evolution. When Voyager landed, their hatred and fear of humans resurfaced, until the ship's crew told them everything that had happened since they left Earth. Finally, the rodents feelings and opinions about humanity have changed.
Before Voyager arrived, Jonathan Brisby, the biggest hero of Ratnia, died in an unknown to the Brisbys and Voyager, but gruesome accident.