Whats are the tribulatory states of river nile Congo Niger and zambezi?

The Nile River has several tributaries, including the Blue Nile and White Nile, which converge in Sudan before flowing northward to Egypt. The Congo River is fed by numerous tributaries, such as the Lualaba and Kasai rivers, contributing to its status as one of the world's largest river systems. The Niger River is supported by tributaries like the Benue and Sokoto rivers, flowing through several West African countries. The Zambezi River receives water from tributaries such as the Luangwa and Kafue rivers, draining into the Indian ocean through Mozambique.