CREATE TABLE table_63214 ("Island" TEXT, "Country" TEXT, "Population" TEXT, "Area km\\u00b2" TEXT, "Density  ( per km\\u00b2 ) " TEXT)

What is Japan's Area km ?
SELECT "Area km\u00b2" FROM table_63214 WHERE "Country" = 'japan'
SELECT "Area km\u00b2" FROM "table_63214" WHERE "Country" = 'japan'