CREATE TABLE table_63219 ("Island" TEXT, "Country" TEXT, "Population" TEXT, "Area km\\u00b2" TEXT, "Density  ( per km\\u00b2 ) " TEXT)

Which island is in the United Kingdom?
SELECT "Island" FROM table_63219 WHERE "Country" = 'united kingdom'
SELECT "Island" FROM "table_63219" WHERE "Country" = 'united kingdom'