Staton Mountains...
Staton Mountains are to the north of the Capital. They stretch to the sea in the east and to the Valent Forest in the west, which is thousands of miles away from the capital.
The Capital City, Valora, was built here because, with the sea to the East, sea trade can be done, and at the same time, various sea resources can be obtained. With the Staton Mountains in the North, there is no lack of monsters and resources.
Since it was the capital, many powerhouses reside in the city, making it secure from any probable monster tides.
Of course, the monster tides that do occur are limited to low-ranking ones. High-ranking ones develop intelligence and wouldn't bother with the capital, as they knew it would be sure death if they went to the capital.
With the presence of two of the top five academies here, the protection of the capital is secured. There was not much worry about that.