Viking ring fortresses

Trelleborg () is a town in Skåne County, Sweden, with 43,359 inhabitants as of 31 December 2015. It is the southernmost town in Sweden located some west from the southernmost point of Sweden and the Scandinavian Peninsula. It is one of the most important ferry towns in Scandinavia as well as around the Baltic Sea, and the main town of the Söderslätt agricultural areas.

type of circular fort built in Scandinavia in the Viking Age

Aggersborg is the largest of Denmark's former Viking ring fortress, and one of the largest archaeological sites in Denmark. It is located near Aggersund on the north side of the Limfjord. It consists of a circular rampart surrounded by a ditch. Four main roads arranged in a cross connects the fortress center with the rampart's outer ring. The roads were tunneled under the outer rampart, leaving the circular structure intact. Many archaeological excavations have been conducted on the site, revealing its original structure and design. These excavations also uncovered a large number of artefacts

circular viking fort in Denmark

Fyrkat is a former Viking ring castle in Denmark, dating from c. 980 AD. It is located near the town of Hobro, some distance from the present end of the Mariager Fjord in Northern Jutland. The fortress is built on a narrow piece of land, with a stream on one side and swampy area on the other sides. Likely built during the reign of Harald Gormsson or his son Sweyn Forkbeard, the fortress may have served as barracks or as a defensive stronghold. It would have help to enable control of the traffic on the main land-based trading route between Aalborg and Aarhus. Because of its unique architecture

castle

Nonnebakken (literally, "The Nun Hill") is a hill in Odense, Denmark. It is the site of one of Denmark's six former Viking ring castles, built during the reign of Sweyn Forkbeard, who had forced his father Harold Bluetooth to leave the country and seek refuge with the Jomsvikings on Wollin (modern Poland) around 975. The fort enabled its occupier to control the Odense River passing next to the hill.

Borgring (older spelling Borrering) also known as Vallø Borgring, is a Danish Viking ring fortress located near Køge on the island of Zealand. Likely built around 970 or 980, the fortress may have been built to defend trade routes or as a military barracks. In 2023, along with four other Viking ring fortresses, Borgring was isncribed on the UNESCO World Heritage List for its unique architecture and testimony to the strategic and military power of the House of Knýtlinga (Jelling dynasty).