Irving Reef
Irving Reef, also known as Balagtas Reef, 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. There is a sand cay near the northern extremity.