Mariveles Reef, known as Nanhai Jiao (Chinese: 南海礁) in China, Terumbu Mantanani in Malaysia, đá Kỳ Vân in Vietnam and Mariveles in the Philippines, is located in the SW of Dangerous Ground in the Spratly Islands. It is 59 kilometres (37 mi) slightly east of north from Swallow Reef and 35 nautical miles (65 km; 40 mi) southeast of Barque Canada Reef.
It dries at high tide enclosing two large lagoons in a figure of eight formation with a sand cay between them. This small cay, 1.5–2 m high, and some isolated rocks are just visible at high water.
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