The following was discussed at the Berlin Conference

Freedom of navigation on the Niger and Congo rivers
Freedom of navigation of the Congo and the Nigeria rivers
Freedom of navigation of the Nile and Congo rivers
Freedom of navigation of the Zambezi and the Congo rivers

These topics were discussed to ensure that European powers could have access to these important waterways for trade and transportation purposes in Africa. The issue of free navigation was a key aspect of the agreements reached at the Berlin Conference, which aimed to regulate European colonization and trade in Africa.