Final answer:
Geographers describe the four population clusters as East Asia, South Asia, North America, and Sub-Saharan Africa.
Step-by-step explanation:
The four population clusters described by geographers are:
- East Asia: This region includes the highly populated countries of China, Japan, and South Korea.
- South Asia: This region includes the countries of India, Pakistan, and Bangladesh.
- North America: This region includes the United States, Canada, and Mexico.
- Sub-Saharan Africa: This region includes countries in Africa south of the Sahara Desert.