Sharp Island or Kiu Tsui Chau (Chinese: 橋咀洲) is the largest island in the Kiu Tsui Country Park located at Port Shelter of Sai Kung, Hong Kong.
[3] When the predicted tides at Ko Lau Wan is lower than or equal to +1.40 meters,[4] visitors are able to visit Kiu Tau (橋頭), an inshore islet, on foot.
This is probably the reason for the widely distributed different volcanic rocks from different geological periods around Sharp Island.
The sea currents near Sharp Island pushed sand and gravel near the shore.
After several years they formed a tombolo, a natural bridge made of different sized rocks and sand – connecting Sharp Island and Kiu Tau (橋頭).