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plural anabranches
(hydrology, of a water channel, especially in Australia) A diverging branch of a river, creek, or stream which re-enters the main stream. quotations
Such branches of a river as after separation reunite, I would term anastomosing branches; or, if a word might be coined, anabranches, and the islands they form branch islands.
1834, Colonel Jackson, “Hints on the Subject of Geographical Arrangement and Nomenclature”, in The Journal of the Royal Geographical Society, Volume 4