Grierson Reef (); Sin Cowe East Island (); Mandarin , is a cay on the eastern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1978. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).
Geography The original island (before additional land reclamation) was approximately long, wide, and surrounded by a sandy shore ranging from in width. The natural land area of the island was approximately . Both ends of the island feature sandbars that shift seasonally with wind and wave patterns.Những điều cần biết về hai quần đảo Hoàng Sa, Trường Sa và khu vực thềm lục địa phía nam (DK1). Cục Chính trị, Bộ Tư lệnh Hải quân (Việt Nam). 2011
In 2014, Vietnam constructed a seawall around the island and expanded it ( long and wide), adding approximately of land, bringing the total area of the island to approximately . From 2019 onwards major defensive structures were built on the island, such as bunkers, coastal fortifications, and possibly missile pads.
On June 7, 2022, the Vietnam Buddhist Sangha inaugurated the Sinh Tồn Đông Pagoda on the island.
Starting in March 2025, Vietnam began land reclamation activities to expand Sinh Tồn Đông Island while dredging a harbor on the southern part of the island.
See also Spratly Islands dispute
References
External links Asia Maritime Transparency Initiative Island Tracker