Borrering, Archaeological site in Zealand, Denmark.
Borrering is a circular Viking ring fortress in Zealand, Denmark, located near the town of Køge. The earthen ramparts form a complete ring, and the original gate openings on the north and east sides are still traceable on the ground.
The fortress was built around 980 AD under King Harald Bluetooth as part of a network of similar ring fortresses across Denmark. It was used for only a short time before being abandoned, and its remains lay largely unnoticed for centuries.
The name Borrering comes from the Danish word for fortress, and the circular shape of the ramparts is still easy to read from ground level. Visitors often walk the full circuit of the earthworks to get a sense of the scale and layout of the original structure.
The site is open year-round and easy to walk around, with paths that follow the outline of the ring. Visiting in dry weather makes the ground more comfortable underfoot, as the earthworks can get muddy after rain.
Borrering was only identified in 2014 when aerial photographs revealed crop marks in the fields above the buried remains. This makes it one of the last of the Danish ring fortresses to be found, despite sitting in a farmed landscape for over a thousand years.
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