From its start to 100 km below Bangui, the Ubangi defines the boundary between the Central African Republic and the Democratic Republic of the Congo (DRC). Thereafter, it forms the boundary between the DRC and the Republic of Congo until it empties into the Congo River.
In the 1960s, a plan was proposed to divert waters from the Ubangi to the Chari River which empties into Lake Chad. According to the plan, the water from the Ubangi would revitalize that lake and provide livelihood in fishing and enhanced agriculture to tens of millions of central Africans and Sahelians. Inter-basin water transfer schemes were proposed in the 1980s and 1990s by Nigerian engineer J. Umolu (ZCN Scheme) and Italian firm Bonifica (Transaqua Scheme) . In 1994, the Lake Chad Basin Commission (LCBC) proposed a similar project and at a March, 2008 Summit, the Heads of State of the LCBC member countries committed to the diversion project . In April, 2008, the LCBC advertised a request for proposals for a World Bank-funded feasibility study.