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Omi-Ọṣun, literally meaning "Ọṣun's waters", is the northernmost source tributary of the Ọṣun River in southwestern Nigeria. The Omi-Ọṣun tributary rises from the eastern sector of the Yoruba hills and flows westwards into the Òyì River which subsequently flows southward along two deep gorges within the Oke-Ila quartzite ridges, (adjacent to Oke-Ila Orangun), before its confluence with other rivers to form the main Osun.

This article does not cite any sources. (December 2009)

Ruins of an ancient settlement called Omi-Ọṣun also exists along the Omi-Ọṣun river. This settlement was a former location of the Oke-Ila Orangun kingdom during the migrations of earlier centuries following the departure of the Oke-Ila and Ila factions from their ancient kingdom and mother city of Ila-Yara.

The name Omi-Ọṣun is attributed to the realization that the tributary feeds the Ọṣun River, as well as its subsequent dedication in ancient times to Ọṣun worship.

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