Hello, I am currently trying to find a good way to create an area within my game in runtime.

However, i can't seem to figure out a good way of doing this..
so i would be happy if anyone here could point me towards the right direction.

Specification example:

Lets say i want to create an area that is 8x8 tiles (8 wide, 8 high) forming a square. now how would i create it in a easy way, without needing to create every single tile and placing them at every single location forming the square ?