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Wikipedia has some good information

The Nile River has two major tributaries: The White Nile: This is the longer of the two tributaries. It begins at Lake Victoria in Uganda and flows through South Sudan and Sudan before joining the Blue Nile in Khartoum, Sudan. The Blue Nile: This tributary begins at Lake Tana in Ethiopia. It contributes about 80-85% of the water to the Nile River during the rainy season. The Blue Nile joins the White Nile in Khartoum. After the confluence of the White and Blue Nile in Khartoum, the river continues to flow northward through Egypt and finally drains into the Mediterranean Sea, forming the Nile Delta. So, in summary, the source of the Nile can be considered to be Lake Victoria for the White Nile tributary and Lake Tana for the Blue Nile tributary.

​@@PlanetichdDoes that mean the source of water of these lakes that form the longest river on the planet are underground springs?

White Nile goes till African Swamps

@@jzaibkhan7864 There are heavy rains each year in the summer in the Ethiopia high areas. If you look at a map of Africa the June - September winds coming off the ocean on the east side bring in a lot of water / rain. It is a large source of water along the entire eastern side of Africa. In the northern hemisphere, the trade winds blow west to east, so for instance a lot of the weather on the US west coast comes from the pacific ocean. The rivers are fed by the winter rain and snow melt. South of the equator, the trade winds blow the opposite direction, east to west, so the moisture comes mostly from the Indian Ocean. In many years, there is flooding along the Nile, especially in Sudan and South Sudan. Even with filling the reservoir behind this dam, there still was flooding in Sudan in 2023. The rain fall is highly variable year to year, which is why Ethiopia made the storage volume so large. The volume frightens some people and makes filling it more complicated, but long term it should provide greater stability. ( hopefully)