Map pieces. Their Subfolders

NOTE: The name of a map must start with the level_ prefix. E.g., level_my_map_01

Regardless of its actual size, every map is conventionally splitted at 16 map pieces that are numbered from [0,0] (as the top left piece) to [3,3] (as the bottom right piece), see the illustration below.

NOTE: The actual size of every piece varies depending on the map size.

If you look into the folder of your map in Media\prebuild, and then proceed to data subfolder there, you will see that set of numbered subfolders, from 0_0 to 3_3, see the screenshot below.

Every such subfolder contains (almost all) data of the corresponding piece of the map. However, there are exceptions to this, such as Rivers, Overlays, and some other entities that are shared between all pieces, see below.