Cavalla River

{{Short description|River in West Africa}}

{{Redirect|Youbou|the small town in western Canada|Youbou, British Columbia}}

{{Infobox river

| name = Cavalla river

| name_other = Cavally, Youbou, Diougou

| image = Cavally.jpg

| image_alt =

| image_caption =

| map = File:Liberia Cavally River.png

| map_alt =

| map_caption = The Cavalla River drains the border areas of Ivory Coast and Liberia.

| source1_location =

| mouth_location = Gulf of Guinea

| progression =

| subdivision_type1 = Countries

| subdivision_name1 = {{hlist|Guinea|Ivory Coast|Liberia}}

| location =

| etymology =

| length = {{convert|515|km|mi|abbr=on}}

| source1_elevation =

| mouth_elevation = {{convert|0|m|ft|abbr=on}}

| discharge1_location=Near mouth

| discharge1_avg = (Period: 1979–2015) {{cvt|37.61|km3/year|m3/s|abbr=on}}{{cite web|url=http://twap-rivers.org/indicators|title=River Basins}}

| basin_size = {{cvt|29,495|km2|mi2|abbr=on}}{{cite web|url=http://twap-rivers.org/indicators|title=River Basins}}

| river_system = Cavalla River

| tributaries_left =

| tributaries_right =

}}

The Cavalla River (also known as the Cavally, the Youbou and the Diougou) is a river in West Africa, originating from north of Mont Nimba in Guinea, through Ivory Coast, to Zwedru in Liberia, and back to the border with Ivory Coast. It ends in the Gulf of Guinea, situated {{convert|21|km|abbr=on|sp=us}} east of Harper, Liberia. It forms the southern two-thirds of the international boundary between Liberia and Ivory Coast.

It has a length of {{convert|515|km|mi|sp=us}}, and is the longest river in Liberia.{{cite book|last=Bateman|first=Graham|author2=Victoria Egan |author3=Fiona Gold |author4=Philip Gardner |title=Encyclopedia of World Geography|publisher=Barnes & Noble Books|location=New York|year=2000|isbn=1-56619-291-9|page=161}} The name is derived from the cavalla horse mackerel found at its mouth.[http://www.britannica.com/eb/article-9021899?tocId=9021899 Cavalla River at Encyclopædia Britannica] It is home to the endemic Chiloglanis normani.