The Kjarrá–Þverá River, located about 115 kilometers from Reykjavík in western Iceland, is a 64-kilometer glacial river known for its salmon fishing.

The upper river, closer to the glacier, is Kjarrá; the in-between is Örnólfsdalsá; the lower river, closer to the sea and "below the fence above Örnólfsdal," is Thervá ().

Kjarrá is a tributary of the glacial river Hvítá (), and has tributaries of its own: Litla-Thvera, Krókavatnsá, and Lambá. The river is part of the Borgarfjörður ecosystem.

Kjarrá and Þverá each have their own fishing lodge, "limited to seven rods each."

See also Hraunfossar, waterfalls upriver

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