|Main source||Lennard River
45 metres (148 ft)
|River mouth||King Sound
|Basin size||13,188 square kilometres (5,092 sq mi)|
|Length||69 kilometres (43 mi)|
The river is formed when the Lennard River splits into two channels north of Mount Marmion and near the Kimberley Downs Station homestead, the other channel being the Meda River. Continuing to flow west north-westward through Poulton Pool until the river eventually discharges into Stokes Bay, King Sound which is north-east of Derby.
The river was named in 1881 by a pioneer of the area, George Julius Brockman during an expedition in the Kimberley area looking for grazing land north of the Fitzroy River. He named the river after the granddaughter of John Septimus Roe, Mary Matilda (May) Thomson.
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- Western Australian Land Information Authority. "History of river names". Archived from the original on 16 February 2015. Retrieved 6 September 2011.
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