Berkenthin is an Amt ("collective municipality") in the district of Lauenburg, in Schleswig-Holstein, Germany. Its seat is in Berkenthin.The Amt Berkenthin consists of the following municipalities (population in 2005 between brackets):Behlendorf (393)Berkenthin (2,027)Bliestorf (693)Düchelsdorf (159)Göldenitz (229)Kastorf (1,146)Klempau (601)Krummesse (1,566)Niendorf bei Berkenthin (187)Rondeshagen (864)Sierksrade (308)