Brestak (in Bulgarian: Брестак) is a village in northern Bulgaria, Valchi Dol Municipality, Varna Province. Before 1934, its name was Karaagach (in Bulgarian: Караагач). In 1961, its population was 2,476, and in 1989 - 1,844.N. Michev. P Koledarov (1989), Dictionary of Living Places and their Names in Bulgaria 1878-1987 [Речник на селищата и селищните имена в България 1878-1987], Sofia: Nauka i Izkustvo, at 48. (in Bulgarian)
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