CREATE TABLE table_1404456_1 (former_province VARCHAR, area__km_2__ VARCHAR)

what's the former province with area (km 2 ) being 12,245.9
SELECT former_province FROM table_1404456_1 WHERE area__km_2__ = "12,245.9"
SELECT "former_province" FROM "table_1404456_1" WHERE "12,245.9" = "area__km_2__"