 Juvenile and subadult speartooth sharks are found in a few large, mangrove-lined tropical rivers in northern Australia and New Guinea, from the estuary to hundreds of kilometers upstream; a single possible record from the South China Sea exists.In Queensland, it occurs in the Wenlock, Ducie, and Bizant Rivers, and perhaps also the Normanby, Hey, and Embly Rivers.In the Northern Territory, it is known from the Adelaide River and the Alligator Rivers.