To provide a general idea of the distances involved, the capital of South Sudan, Juba, is located approximately 1,000 kilometers (621 miles) from the Nile River at its closest point. The Nile River then flows northward through Sudan and Egypt before reaching the Mediterranean Sea. The capital of Ethiopia, Addis Ababa, is located approximately 1,500 kilometers (932 miles) from Juba.
It's important to note that these distances are approximate and can vary depending on the exact starting and ending points you choose. Additionally, the terrain and accessibility of the areas can also affect the實際距離。