Buayanyup River

{{Short description|River in Western Australia}}

{{Use Australian English|date=December 2013}}

{{Use dmy dates|date=December 2023}}

{{Infobox river

| name = Buayanyup River

| image =

| source1_location = Whicher Range

| mouth_location = Geographe Bay

| subdivision_type1 = Country

| subdivision_name1 = Australia

| length_km = 27

| source1_elevation = {{convert|60|m|ft|0}}{{cite web|url=http://maps.bonzle.com/c/a?a=p&cmd=sp&p=198762&st=&s=Abba%20River|title= Bonzle Digital Atlas – Map of Buayanyup River|year= 2009|access-date= 9 April 2011}}

| mouth_elevation = sea level

| discharge1_avg =

| basin_size_km2 = 163|basin_size_ref={{cite web|url=http://www.watercorporation.com.au/B/busselton_eii_catchment.cfm|title=Water Corporation - Catchment Characteristics|year= 2009|access-date= 9 April 2011|url-status=dead|archive-url=https://web.archive.org/web/20080725034829/http://www.watercorporation.com.au/B/busselton_eii_catchment.cfm|archive-date= 25 July 2008|df=dmy-all}}

}}

The Buayanyup River is a river in the South West region of Western Australia.

The headwaters of the river rise in the Whicher Range and flow north crossing the Bussell Highway near Vasse before discharging into Geographe Bay near Abbey about {{convert|8|km|mi|0}} west of Busselton.{{Citation | author1=Garnett, Ron | title=Buayanup Drain, Busselton, 20 January 2004 | publication-date=2004 | url=https://trove.nla.gov.au/work/251681588 | access-date=22 July 2024}} The river has three main tributaries of Dawson Gulley, Ironstone Gully and the other is not named. In total the river has a stream length of over {{convert|100|km|mi|0}}.{{cite web|url=http://www.water.wa.gov.au/PublicationStore/first/97057.pdf|title=Buayanyup River Action Plan|year=2010|access-date=9 April 2011|url-status=dead|archive-url=https://web.archive.org/web/20110330204149/http://www.water.wa.gov.au/PublicationStore/first/97057.pdf|archive-date=30 March 2011|df=dmy-all}}

The river and the Carbunup River have fishery resource issues in common.{{Citation | author1=Beatty, S | author2=Morgan, D | author3=Allen, M | title=Freshwater fish and crayfish communities of the Carbunup and Buayanyup Rivers: conservation significance and management considerations | publication-date=2009 | publisher=Murdoch University. Centre for Fish & Fisheries Research | url=https://trove.nla.gov.au/work/254210462 | access-date=22 July 2024}}

The river flows through agricultural land that is predominantly used for raising beef and dairy cattle and to a lesser degree plantation timber and viticulture. The area has been settled since 1834 when the Bussell family established a cattle station along the Vasse River. More farming families followed and now over 50% of the catchment is used for cattle farming.

The name of the river was first recorded by a surveyor in 1839 and is Aboriginal in origin but its meaning is unknown.{{LandInfo WA|r|B|9 March 2011}}