Swallow Reef, known as Pulau Layang-Layang (Malay and Dusun for Place of Swallows) in Malaysia, Danwan Jiao (Chinese: 弹丸礁) in China, Celerio in the Philippines and Đá Hoa Lau in Vietnam, is an oceanic atoll of the Spratly Islands situated approximately 300 km northwest of Kota Kinabalu, Sabah.