|Main source||North East of Wagin
345 metres (1,132 ft)
|River mouth||Arthur River
243 metres (797 ft)
|Length||35 kilometres (22 mi)|
The river rises in the hills to the southern side of the Yackrkine Range and flows in a westerly direction then past Muggerrugging Rock then it turn to the south-west and discharges into the Arthur River of which it is a tributary between the towns of Piesseville and Wagin.
The river's catchment falls within the Blackwood catchment's Beaufort zone as part of the Dellyanine system. The system is composed of undulating rises and low hills on granite and was a wandoo sheoak woodland but has now mostly been cleared for agriculture.
- "Bonzle Digital Atlas – Map of Buchanan River". 2010. Retrieved 22 August 2010.
- Western Australian Land Information Authority. "History of river names". Archived from the original on 16 February 2015. Retrieved 3 September 2011.
- "Blackwood catchment, Beaufort zone catchment appraisal" (PDF). 2003. Retrieved 2 September 2010.
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