The Gloster River is a river in the Marlborough region of New Zealand.

It arises on the northern slope of Dillon Cone in the Inland Kaikōura Range and flows north, then south-east and east to join the Waiau Toa / Clarence River which eventually exits into the Pacific Ocean.

[1] In 1888, the Gloster River formed a boundary between the counties of Marlborough and Kaikoura.

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