Cass River (Mackenzie District)
 The Cass River is an alpine river in the Canterbury Region of the South Island of New Zealand. It rises in the Hall Range immediately below Rankin Pass and also receives water from the nearby Huxley Glacier. After dropping 600 metres (2000 ft) very rabidly the river flows south with braided channels along a flat-bottomed valley for 25 kilometres (16 mi).