Sand Cay, also known as Bailan Island and Son Ca Island, is a cay on the north edge of the Tizard Bank of the Spratly Islands in the South China Sea. With an area of 7 hectares, it is the ninth largest, and the fourth largest Vietnamese-administered, of the Spratly Islands. The island has been occupied by Vietnam since 1974. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).
Tensions erupted in the South China Sea as the Philippines accused China of dangerously sideswiping and water-cannoning its coast..