The two major cataracts are the first below Ubundu, forming a narrow and crooked stream that is hardly accessible, and the last that can be seen and visited from Kisangani. At the bottom of the rapids, the Lualaba is known as the Congo River. A 1m-gauge portage railway bypasses the series of rapids, connecting Kisangani and Ubundu.
The two major cataracts are the first below Ubundu forming a narrow and crooked stream that is hardly accessible and the last that can be seen and visited from Kisangani At the bottom of the rapids the Lualaba is known as the Congo River A 1m-gauge portage railway bypasses the series of rapids connecting Kisangani and Ubundu