{{Short description|River in North Central Nigeria}} {{Use Nigerian English|date=May 2026}} {{Infobox river | name = Orisa | native_name = {{nativename|yo|Odò Òrisá}} | image = River Orisa in Olla Town.jpg | map = | image_caption = The Orisa in Olla, Kwara State. | source1_location = Ora-Igbomina | source1_coordinates= {{coord|7|42|36|N|4|40|2|E|name=Orisa source}} | mouth_location = River Niger | mouth_coordinates = {{coord|5|33|0|N|6|33|0|E|format=dms|display=inline,title}} | progression = River Niger→ Gulf of Guinea | subdivision_type1 = Country | subdivision_name1 = Nigeria | length = {{convert|300|km|mi|abbr=on}} | source1_elevation = | discharge1_avg = | basin_size = }} The '''Orisa River''' ({{lang|yo|Yorùbá:}} {{IPA|yo|òɾisá|}}) is a river in Kwara State, Nigeria. It is an alluvial river and tributary with a 300-kilometre (186mi) path originating in Ọra and flowing through various towns like Aran-Orin, Rore, Olla and Omu-Aran before draining into the River Niger.<ref>{{Cite book|title=Water Resources in Kwara State Nigeria|last=Oyegun|first=Rowland|URL=https://www.google.com.ng/books/edition/Water_Resources_in_Kwara_State_Nigeria/h8EMAQAAIAAJ?hl=en|publisher=Matanmi & Sons Printing & Publishing Company|isbn=9781870125}}</ref><ref>{{Cite web|title=Boundary Influence and Flow Characteristics of Orisa and Ala Rivers in Kwara and Ondo States, Nigeria|url=https://eprints.lmu.edu.ng/3836/1/6%20Paper%20on%20Boundary%20Influence.pdf|access-date=March 1, 2026 |website=Landmark University Repository}}</ref><ref>{{Cite web |title=Assessment of levels of some physico-chemical parameters and heavy metals of Orisa River, Omu-Aran, Nigeria|url=https://www.researchgate.net/publication/352374043_Assessment_of_levels_of_some_physico-chemical_parameters_and_heavy_metals_of_Orisa_River_Omu-Aran_Nigeria|access-date=March 1, 2026 |website=ResearchGate}}</ref>
== References == {{reflist}}
== External links == {{Wiktionary|Orisa}}
Category:Kwara State Category:Rivers of Nigeria Category:Tributaries of the Niger River