Swallow Reef, known in Malay as Pulau Layang-Layang, is an oceanic atoll located within the Spratly Islands. It is currently under the administration of Malaysia.
The reef is also referred to by several other names, including Đá Hoa Lau in Vietnamese, Yànzi Dǎo in Mandarin Chinese (pinyin: Yànzi Dǎo), and Celerio Reef.