The Borneo river shark (Glyphis fowlerae) is a species shark of the family Carcharhinidae known only from the Kinabatangan River in Borneo. It can reach a length of 78 centimetres (31 in). Reproduction is presumed to be viviparous. Only 13 specimens are known to science collected in 1996. Expeditions in 2010 and 2011 failed to find any and while fishermen recognised the shark, they have not been seen for many years. Other members of the family found at the mouth of tropical rivers include bull sharks, speartooth sharks, Irrawaddy river sharks, northern river sharks and Ganges sharks. They all can survive in both saltwater and freshwater.