Anabranch

Anabranches at the junction of the Yukon River and the Koyukuk River in Alaska, August 24, 1941.

An anabranch is a section of a river or stream that diverts from the main channel or stem of the watercourse and rejoins the main stem downstream. Local anabranches can be the result of small islands in the watercourse. In larger anabranches, the flow can diverge for a distance of several kilometres before rejoining the main channel.

Word usage and related terms

The term anabranch, in its hydrological meaning, is used more frequently in Australia than in the rest of the English-speaking world.

The term anastomose river describes a river with many anabranches.

The term braided river describes watercourses which are divided by small islands into multiple channel threads within a single main channel, but the term does not describe the multiple channels of an anabranching river.

A distributary is a branch of a river that does not rejoin the main channel; these are common on and near river deltas.

A bayou is often an anabranch.

Examples

• In the Fraser River delta of British Columbia, Canada, North Arm Fraser River, Middle Arm Fraser River, and South Arm Fraser River each fall into Georgia Strait separately. On the other hand, Annacis Island splits (South Arm) Fraser River into the (main) Annievile Channel and the (smaller) Annacis Channel, which rejoin below the island.

• On the Darling River in New South Wales, the river divides south of Menindee for a hundred kilometres before rejoining. The anabranch contains flowing water only in wetter years.
• The Bahr el Zeraf in southern Sudan splits from the Bahr al Jabal section of the White Nile and flows for 240 km (150 mi), before rejoining the White Nile proper upriver from Malakal.
• Approximately twenty-five minutes out of Charters Towers is a section of the Burdekin River known as 'the anabranch'. This strip of water is separate from the main flood way, and is typically dry during the sunnier months. Once there is consistent rain, it will meet up with the river again and flood with fresh water. It is well known for barramundi fishing.

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