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_name_43 ( region INTEGER, area__km_2__ VARCHAR, population VARCHAR )

### Question ###
What is the average region that has an Area (km 2 ) of 451.79, and a Population under 496,257?

### Accurate SQL ###

SELECT AVG(region) FROM table_name_43 WHERE area__km_2__ = 451.79 AND population < 496 OFFSET 257