Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE city ( city VARCHAR, regional_population VARCHAR )

### Question ###
Which three cities have the largest regional population?

### Accurate SQL ###

SELECT city FROM city ORDER BY regional_population DESC LIMIT 3