Pulau Sekudu (Chinese: 青蛙岛), or Frog Island, is an islet located just off Chek Jawa on Pulau Ubin, Singapore. It lies in the Serangoon Harbour opposite Changi. Despite its proximity, it is only reachable by boat, even at low tides. One can see the islet directly opposite the Chek Jawa Visitor Centre.