Henry Morton Stanley reached the confluence of the two rivers on 6 Jan. 1877, "the affluent Lumami, which Livingstone calls 'Young's river,' entered the great stream, by a mouth 600 yards wide, between low banks densely covered with trees."[2]: Vol.Two, 176
In October 1889 M. Janssen, Governor-General of the Congo State, explored the Lomani river upstream from Isangi on the Ville de Bruxelles. After steaming for 116 hours he was stopped by rapids at a latitude of 4°27'2" S.[3]