|Basin countries||New Zealand|
|Length||40 kilometres (25 mi)|
The Leatham River is a river of the Marlborough Region of New Zealand's South Island. It is the main tributary of the Branch River, itself a tributary of the Wairau River. The Leatham flows north in a parallel valley to the Branch for most of its length before turning northwest to join with the Branch six kilometres from its outflow into the Wairau 40 kilometres south of Richmond, New Zealand.
"Place Name Detail: Leatham River". New Zealand Geographic Placenames Database. Land Information New Zealand. Retrieved 12 July 2009.
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