CREATE TABLE table_171320_3 (region_1 VARCHAR, region_4 VARCHAR)

Name the region 1 where region 4 for april 2, 2009
SELECT region_1 FROM table_171320_3 WHERE region_4 = "April 2, 2009"
SELECT "region_1" FROM "table_171320_3" WHERE "April 2, 2009" = "region_4"