What is the average region that has an Area (km 2 ) of 451.79, and a Population under 496,257?
CREATE TABLE table_10688 (
    "Code" real,
    "Type" text,
    "Name" text,
    "Area (km 2 )" real,
    "Population" real,
    "Regional County Municipality" text,
    "Region" real
)
SELECT AVG("Region") FROM table_10688 WHERE "Area (km 2 )" = '451.79' AND "Population" < '496,257'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average region that has an Area (km 2 ) of 451.79, and a Population under 496,257? ### Input: CREATE TABLE table_10688 (
    "Code" real,
    "Type" text,
    "Name" text,
    "Area (km 2 )" real,
    "Population" real,
    "Regional County Municipality" text,
    "Region" real
) ### Response: SELECT AVG("Region") FROM table_10688 WHERE "Area (km 2 )" = '451.79' AND "Population" < '496,257'