Mischief Reef, also known as Panganiban Reef, is a low tide elevation (LTE) reef/atoll surrounding a large lagoon in the SE of Dangerous Ground in the east of the Spratly Islands in the South China Sea. It is located 250 kilometres (130 nmi) west of Palawan Island of the Philippines. Administratively, it belonged to the Kalayaan Islands municipality of the province of Palawan. It is also under the de facto jurisdiction of Nansha islands, Sansha City, Hainan province, China. Activities by the People's Republic of China (PRC) in the mid-2010s have created a large artificial island on the atoll including an approximately 2,700-metre (8,900 ft) runway and associated airfield.