Scarborough Shoal, also known as Bajo de Masinloc, Huangyan Island, Minzhu Jiao and Panatag Shoal, are two skerries (rocks) located between Macclesfield Bank to the west and Luzon to the east. Luzon is 220 kilometres (119 nmi) away and the nearest landmass. The atoll is a disputed territory claimed by the Republic of the Philippines through the 1734 Velarde map, while the People's Republic of China and the Republic of China (Taiwan) claim it through the disputed nine-dash line. The atoll's status is often discussed in conjunction with other territorial disputes in the South China Sea such as those involving the Spratly Islands, and the 2012 Scarborough Shoal standoff. It was administered by the Philippines as part of its Zambales province, until 2012, when a standoff was initiated by China through the use of warships against fishing boats, resulting in effective capture by the Chinese maritime forces.

The nine-dash line, also referred to as the eleven-dash line by Taiwan, is a set of line segments on various maps that accompanied the claims of the People's Republic of China and the Republic of China in the South China Sea. The contested area includes the Paracel Islands, the Spratly Islands, the Pratas Island and the Vereker Banks, the Macclesfield Bank, and the Scarborough Shoal. Certain places have undergone land reclamation by the PRC, ROC, and Vietnam. The People's Daily of the PRC uses the term Duànxùxiàn (断续线) or Nánhǎi Duànxùxiàn, while the ROC government uses the term Shíyīduàn xiàn.