The Blue Jewel Valley was once a famous tourist spot before the Cataclysm/Demon Invasion.'
It is 100 kilometers long, 20 kilometers wide, and 1.5 kilometers deep. It housed all manner of flora and fauna. According to history, many people were fond of this place, making it a famous spot for various activities all year round.
The valley wasn't spared from the invasion, however. It took humanity a lot of time and resources to restore its nature and make it habitable again. Even then, it's never been the same.
Nowadays, the Blue Jewel Valley serves entirely as a spot to contain the convicts of the Risk Management Center, it wasn't the only one of course, but it's one of the largest branches out there. The whole valley serves as a trap for any possible outbreaks, it's also far enough from the nearest civilization so it gained its purpose.
