Sand Cay 10°22′30″N 114°28′48″E, also known as Bailan Island; Son Ca Island; Mandarin Chinese: 敦謙沙洲/敦谦沙洲; pinyin: Dūnqiān Shāzhōu, is a cay on the north edge of the Tizard Bank of the Spratly Islands in the South China Sea. Wikipedia