In the Instagram Demographics section you'll see different statistics about your followers:
gender structure
age structure
what are the top locations fans are coming from (Top countries and Top cities)
what are the top languages fans speak (Top languages).
Hover over the map with your cursor to see how many fans you have in each country! These numbers would be hard to locate in Facebook's native Insights.
You will also learn the characteristics of your average fan - their age, gender and
location.
These demographic insights can help you to target your content better.
Note: This demographic report is only available if you have at least 100 followers (source).
Please note that since Facebook has decided to restrict access to some API endpoints in April 2018, some data might be missing before this date - we're not able to recover any missing metrics before April 2018.