Bombay Castle (South China Sea)
Bombay Castle, also known in ; Mandarin ; Abad Santos Shoal (), is a shoal with a lighthouse in the Rifleman Bank of the southern Spratly Islands. It is occupied by Vietnam, but also claimed by China (PRC) and Taiwan (ROC). Location and topography. Bombay Castle consists of a submerged reef located between and (between and ) at the northern end of Rifleman Bank. At its shallowest point, it has a depth of consisting of sand and coral. It is east of Huyền Trân (Alexandra Bank) and nearly west of An Bang (Amboyna Cay). Bombay Castle has a tall  lighthouse on steel pilings that was built in 1995. The lighthouse is two storied, with accommodation for the lighthouse keepers and a dish antenna. The reef is named after the East Indiaman . DK1 rigs. In addition to the lighthouse (DK1/21), three other DK1 rigs ("economic, scientific and technological service stations") have been constructed by Vietnam in this area. The current (2015) cluster has 3 rigs in use.