Lankiam Cay Tagalog: Panata, literally "oath"; Chinese: 杨信沙洲; pinyin: Yangxin Shazhou; Vietnamese: đá An Nhơn) is the smallest of the naturally occurring Spratly Islands. It has an area of 0.44 hectares (1.1 acres) (4,400 sq. m), and is located about 7 nautical miles (13 km; 8.1 mi) eastnortheast of Philippine-occupied Loaita (Kota) Island, just west of the north of Dangerous Ground.(
The island is administered by the Philippines as part of Kalayaan, Palawan, and is the seventh largest of the Philippine-occupied islands. It is also claimed by the People's Republic of China, the Republic of China (Taiwan), and Vietnam.
At one time the island had a surface area of more than 5 hectares, but strong waves brought by a strong typhoon washed out the sandy surface (beach) of the island leaving behind the calcarenite foundation that can be seen at low tide. It has a wide lagoon.
The island is guarded by soldiers stationed at nearby Loaita Island who regularly visit. It is kept under observation from a tall structure on Loaita Island.