|Name origin: Admiral Sir Edmund Lyons|
|Part of||Gascoyne River catchment|
|- left||Calbrajacka Creek, Onslow Creek, Edmund River, Frederick River|
|- right||Koorabooka Creek|
|- location||below Staten Hill|
|- elevation||535 m (1,755 ft)|
|Mouth||confluence with the Gascoyne River|
|- location||Jimba Jimba|
|- elevation||137 m (449 ft)|
|Length||561 km (349 mi)|
|- average||460,600 m3/s (16,265,935 cu ft/s)|
|National park||Kennedy Range National Park|
The headwaters of the Lyons rise just west of the Teano Range and the river flows generally south-west, joined by 36 tributaries including the Edmund River, Frederick River, Onslow Creek, Gifford Creek, Koorabooka Creek and Ulura Creek. The Lyons reaches its confluence with the Gascoyne River near the township of Gascoyne Junction near the southern end of the Kennedy Range. The river descends 398 metres (1,306 ft) over its 561-kilometre (349 mi) course.
Several permanent pools of water exist along the river including Cattle Pool, Windarrie Pool and Bubbawonnara Pool.
The Lyons River is known as Mithering by the local Indigenous Australians, the Malgaru people. The first European to discover the river was explorer Francis Gregory in 1858, he named the river after the naval hero Admiral Sir Edmund Lyons.
- Western Australian Land Information Authority. "History of river names". Archived from the original on 16 February 2015. Retrieved 8 January 2009.
- "Map of Lyons River, WA". Bonzle Digital Atlas. 2008. Retrieved 23 September 2015.
- "River Monitoring Stations - Lyons River". Department of Water. Government of Western Australia. 2008. Retrieved 8 February 2009.
- "Parkfinder - Kennedy Range National Park". Department of Environment and Conservation. Government of Western Australia. 2008. Retrieved 15 October 2010.
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