Zhubi Reef (Subi Reef in the west) is a reef in the southwest of Zhongye Reef in Nansha Islands, located 26 kilometers southwest of Zhongye Island, with coordinates of.

Pig nose angle

North latitude 10 54'47.63 inches, east longitude1143' 41.36 inches. It is about 6.5 kilometers from northeast to southwest and 3.7 kilometers wide. There is a shallow lake in the middle, and there is no waterway to the outside world. This is because the atoll reef plate is well developed. The water in the lake is blue and green.

The name "Zhu Bi" comes from the translation of the name "Soapy" on the British chart, but the name comes from the British survey ship consulting fishermen in China and learning that this atoll is called "Ugly Guardian". "Ugly" because this atoll is in the southwest of Zhongye Island. Fishermen in China often come here to pick up horseshoe snails, calling them ugly (Soapy in Hainan, China), hence the English name Subi Reef.