Bucu
Bucu or Buku is a hill island surrounded by the Trave and Wakenitz Rivers in Lübeck, Germany. It is also the name of a medieval Slavic castle, now ruined, on the island. Count Adolf II of Holstein founded Lübeck on the island in 1143.[1] The Burgkloster, or fortified monastery, of Lübeck is located atop the ruins of Bucu. "Bucu" is also the name of a hill.