north and west on both sides of the Fly river in vast plains, little elevated above sea-level.
Some Cretaceous or Upper Jurassic rocks occur in the basin of the Fly river.
Most of western British New Guinea consists of recent superficial deposits, in the basin of the Fly river.
On the banks of the Fly river d'Albertis observed at least two widely differing types, those on its upper course bearing some resemblance to the tribes of the eastern coast.
In the Fly River region, kava, prepared from Piper methysticum, is drunk without any of the ceremonial importance associated with it in Polynesia.