CREATE TABLE table_10688 ("Code" FLOAT, "Type" TEXT, "Name" TEXT, "Area  ( km 2  ) " FLOAT, "Population" FLOAT, "Regional County Municipality" TEXT, "Region" FLOAT)

What is the average region that has an Area (km 2 ) of 451.79, and a Population under 496,257?
SELECT AVG("Region") FROM table_10688 WHERE "Area (km 2 )" = '451.79' AND "Population" < '496,257'
SELECT AVG("Region") FROM "table_10688" WHERE "Area (km 2 )" = '451.79' AND "Population" < '496,257'