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When the regions are too large, you break them up into sub-regions.
sub levels
Some sub-regions of Latin America include the Caribbean, Central America, South America, and Mexico. Each of these sub-regions has its own unique cultural, historical, and geographical characteristics that distinguish it from the others.
the sub Saharan regions of the African Continent
costal,tropics,grassland,savanna
Canada
There are three regions in Afghanistan that are split into sub-regions. Northern Afghanistan is split into the sub-regions of North Eastern Afghanistan and North Western Afghanistan. Central Afghanistan is split into the sub-regions Eastern Afghanistan, Central Afghanistan, and Western Afghanistan. The region of Southern Afghanistan is split into the sub-regions South Eastern Afghanistan, and South Western Afghanistan.
There are actually six sub-regions that make up the Middle East: Anatolia, Mesopotamia, Persia, Arabia, Levant, and Egypt.
In the Savanna regions of Sub Saharan Africa
Sub-Saharan Africa
The two largest cultural regions in Africa are Sub-Saharan Africa and North Africa.
A walrus is a marine mammal and loves to be in cold climates. You can find walrus' in the Artic regions, as well as sub-Artic regions.