What do Russia, the Caucasus, and Central Asia have in common?

They all live in mountain areas.
They all live in mountain areas.

Many different ethnic groups live in each area.
Many different ethnic groups live in each area.

Russian is the most common language.
Russian is the most common language.

All people in all areas only practice Islam.

Not all people in all areas only practice Islam. While Islam is one of the major religions in the Caucasus and Central Asia, there are also significant populations practicing other religions such as Christianity, Judaism, and Buddhism. In Russia, the religious landscape is diverse with a mix of Orthodox Christianity, Islam, and other religions.

They all live in mountain areas.

They all live in mountain areas.

Many different ethnic groups live in each area.
Many different ethnic groups live in each area.

Russian is the most common language.
Russian is the most common language.

All people in all areas only practice Islam.

pick one

Many different ethnic groups live in each area.