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 table_23248420_1 ( county VARCHAR, region_province VARCHAR, rank VARCHAR )

### Question ###
When 20 is the rank and north west is the region/province what is the county?

### Accurate SQL ###

SELECT county FROM table_23248420_1 WHERE region_province = "North West" AND rank = 20