Irving Reef, also known as Balagtas Reef (; Mandarin , ), is a coral atoll in the Spratly Islands, South China Sea. It is occupied by the Philippines as part of Kalayaan, Palawan, and is also claimed by the People's Republic of China, the Republic of China (Taiwan) and Vietnam.
The atoll is southwest of West York Island. It is in length.D. J. Hancox, John Robert Victor Prescott, A Geographical Description of the Spratly Islands and an Account of Hydrographic Surveys Amongst Those Islands (International Boundaries Research Unit, 1995, , p. 7. Excerpts available at Google Books. There is a sand cay near the northern extremity.
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