evidence: Uganda is the DRC’s eastern neighbor. The two countries share a land border that stretches 545 miles in length. The Ruwenzori Mountains, a mountain range with Sub-Saharan Africa’s third-highest peak, is situated on the border. The international border starts at the tri-point connecting South Sudan, the DRC, and Uganda, and moves southwards to the Rwanda-DRC-Uganda tri-point, marked by the 11,959-foot high Mount Sabyinyo. The Semliki River is an 87-mile long river that forms part of the Uganda-DRC border.