anabranch

n. anastomotic branch (stream which branches off of a river)

An anabranch is a section of a river or stream that diverts from the main watercourse channel (or mainstem) and rejoins the mainstem downstream.In the simplest case, an island or rock in the river creates a main course and an anabranch course; a more significant anabranch would diverge for a distance of several kilometres before rejoining.River deltas branch into large numbers of courses, though these are not normally regarded as anabranches, as the net result is usually multiple discharge points rather than a rejoined unified flow.
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anabranch /'ænəbrɑ:ntʃ/
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