Bombay Castle, also known in Vietnamese: Đá Ba Kè; Mandarin Chinese: 蓬勃堡; pinyin: Péngbó Bǎo;[1] Abad Santos Shoal (Filipino: Buhanginan ng Abad Santos, lit.

'Sandbank of Abad Santos'), is a reef with a lighthouse in the Rifleman Bank of the southern Spratly Islands.

Bombay Castle consists of a submerged reef located between 07°50′N 111°40′E / 7.833°N 111.667°E / 7.833; 111.667 and 07°56′N 111°42′E / 7.933°N 111.700°E / 7.933; 111.700 (between 07°50′N 111°40′E / 7.833°N 111.667°E / 7.833; 111.667 and 07°56′N 111°42′E / 7.933°N 111.700°E / 7.933; 111.700) at the northern end of Rifleman Bank.

[6] Bombay Castle has a 22.5 metres (74 ft) tall lighthouse on steel pilings that was built in 1995.

[9] 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.