Serangoon Harbour (; ) is a harbour in Singapore located between the mainland island of Singapore (Pulau Ujong) and Pulau Ubin. History Before the founding of modern Singapore in 1819, the nearby Pulau Seletar and Pulau Ubin were home to the indigenous Orang Laut and Orang Seletar, who sailed and lived along the Serangoon Harbour, as well as the larger Straits of Johor. The harbour was later transformed into an important port in the northeast of the island, as quarry and timber from the neighbouring Johor and Pulau Ubin became lucrative. Access to the harbour from the city was primarily via Serangoon Road. In World War II, the British and Allied troops mistakenly believed that the Imperial Japanese Army would invade Singapore by crossing the Serangoon Harbour after the Japanese troops moved into and captured Pulau Ubin. However the Japanese troops eventually landed on the northwest of the island far from the harbour. Geography Serangoon Harbour is part of the Straits of Johor. It is south of the Nenas Channel which is the section of the Straits of Johor that lies between mainland Malaysia and Pulau Ubin. The Serangoon Harbour lies entirely within Singapore territorial waters, in contrast only a small strip of the Nenas Channel lie within Singapore territorial waters. The depth of Serangoon Harbour is generally deep enough for commercial ships to pass on its way to either the Sembawang Dock in Singapore or Pasir Gudang Johor Port in Malaysia, although the Squance Bank near Pulau Ubin has shallower depths. The islands of Coney Island, Pulau Ketam and Pulau Sekudu lie within this harbour. The rivers of Sungei Changi, Sungei Selarang, Sungei Loyang, Sungei Tampines and Sungei Api-Api, from east to west on mainland Singapore are tributaries into the harbour. The Sungei Serangoon and Sungei Punggol are no longer tributaries into the harbour after they have been dammed to create their respective reservoirs. The rivers of Sungei Tiga, Sungei Jelutong, Sungei Puaka and Sungei Teris from east to west on Pulau Ubin are also tributaries into the harbour. Infrastructure There are many kelongs in the Serangoon Harbour, these belong to fishermen who rear fishes and other sea animals that are sold in Singapore. These fishermen mainly use Changi Point Ferry Terminal or Lorong Halus Jetty as a drop off point to come onto mainland. The part of Serangoon Harbour off Pasir Ris Park have floating buoys to demarcate