Swallow Reef, also known as Malay: Pulau Layang-Layang; Vietnamese: Đá Hoa Lau; Mandarin Chinese: 燕子島; pinyin: Yànzi Dǎo; Celerio Reef, is an oceanic atoll of the Spratly Islands administered by Malaysia, which is situated approximately 300 kilometres northwest of Kota Kinabalu, Sabah.