On 28 September 1909, a detachment of the Dutch navy under Captain F.J.P. Sachse came ashore at Humboldt Bay near the mouth of the Numbay river. Their task was the systematic exploration of northern New Guinea and the search for a natural border between the Dutch and German spheres on New Guinea. Their camp along the river was called Kloofkamp, a name still in use as the name of an ancient district of Jayapura. Forty coconut trees were cut down for the establishment of the camp. They were bought from the owners at a cost of one rijksdaalder per palm.
