TheIlocos Regionis anadministrative regionof the Philippines, designated asRegion I, occupying the northwestern ection ofLuzon. It is bordered by theCordillera Administrative Regionto the east, theCagayan Valleyto the northeast and southeast, and theCentral Luzonto the south. To the west lies theSouth China Sea.It’s known for its historic sites, beaches and the well-preserved Spanish colonial city of Vigan.