It rises in the Hall Range immediately below Rankin Pass, and also receives water from the nearby Huxley Glacier on Mount Hutton.

[1] After dropping 600 metres (2,000 ft) very rapidly the river flows south with braided channels along a flat-bottomed valley for 25 kilometres (16 mi).

[2] The river flows into the west side of Lake Tekapo where it has built up a gravel delta.

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