The Suifon Desert
A desert at the far end of the Leonidas kingdom's borders standing at the epicenter of their rival kingdom, the Sekai Kingdom.
It was a desert that was not only harsh to anyone who came by it but its residents as well. That's why no human being were capable enough to live at that place, the only things that remained were large monsters.
Scorpions, Sandworms, Vipers etc.
To put it simply, you would be stupid to venture at such places. Especially if you're not prepared to fight them or at the very least, ready to die in many painful ways.
But the desert wasn't just that, the desert also acted as a sort of defensive state for both kingdoms. Making it hard for both kingdoms to invade the other one quickly or without causalities.
The desert was long, long enough to make sure there wasn't any shortcut the kingdoms could take to launch a surprise attack at one another. But there were some places at the deserts where there were almost zero chances of monster attacks.
