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In page Nile:

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The source of the White Nile, even after centuries of exploration, remains in dispute. The most remote source that is indisputably a source for the White Nile is of the Kagera River; however, the Kagera has multiple tributaries that are in contention for the farthest source of the White Nile. Two start in Burundi: the Ruvyironza River (also known as the Luvironza) and the Rurubu River.[5][4] In addition, in 2010, an exploration party in Rwanda[6] went to a place described as the source of the Rukarara tributary,[7] and by hacking a path up steep jungle-choked mountain slopes in the Nyungwe Forest found (in the dry season) an appreciable incoming surface flow for many kilometres upstream, thence finding a new source, giving the Nile a length of 6,758 km (4,199 mi).[citation needed]