Wikipedia
Borrering
Borrering (1682: Borre Ring; 1877 & 1992: Borrering) also known as Vallø Borgring or Vallo ring-fortress (also Borgringen ved Lellinge, Lellinge Ringborg, Borgring, Borgerring, Borring and other names) is a Danish Viking fortification located on Zealand, east of Gammel [Gl.] Lellingegaard in the parish of Højelse and north-east of Lellinge. The ring sits on land under the Chapter of Vallø (the land and Gl. Lellingegaard has been a part of the estate of Vallø (later Chapter of Vallø) since 1721).