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Alcek (Bulgar: Altsikurs) was the leader of an Utigur Bulgar horde that settled in the villages of Gallo Matese, Sepino, Boiano and Isernia in the Matese mountains of central Italy.
Its source is in the comune of Bojano and during the first few kilometres of its course it receives the waters of numerous streams which flow from the Matese mountains.