Irving Reef

Irving Reef, also known as Balagtas Reef (Bahura ng Balagtas; Mandarin, đá Cá Nhám), 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 11 nmi southwest of West York Island. It is 2 nmi in length. There is a sand cay near the northern extremity.