Table schema:
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?
SQL: SELECT AVG(region) FROM table_name_43 WHERE area__km_2__ = 451.79 AND population < 496 OFFSET 257