Ertholmene

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This article is about the island fortresses in Denmark. For the fortress in Norway, see Christiansø Fortress.

Fæstningen Christiansø
Northeast of Bornholm, Denmark
Type	Naval fortress
Built	1684
In use	1684-1855 (1863)
Controlled by	Denmark
Battles/wars	Gunboat War

Christiansø in 2001

Ertholmene, generally called Christiansø, is a small archipelago situated approximately 18 km northeast of Bornholm in the Baltic Sea. Its permanent population is 95 (2007) and its area is 39 hectares. Ertholmene belongs to Denmark and contains that country's easternmost point.

Ertholmene consists of three main islands, Christiansø (named after King Christian V), Frederiksø (named after King Frederick IV) and Græsholm, plus a number of minor rocks and skerries. The best known of the latter are Tat and Østerskær, Denmark's easternmost point. Christiansø makes up 22.3 hectares, Frederiksø 4, and Græsholm 11 hectares. Only Christiansø and Frederiksø are inhabited, while Græsholm is a bird reserve. The sound between Christiansø and Frederiksø, a well-sheltered natural harbour, is crossed by a pedestrian bridge that is pulled aside to accommodate larger vessels.

Fishermen from Bornholm have used Ertholmene for temporary shelter since the Middle Ages. The first permanent inhabitation was the result of the Danish-Swedish conflicts in the late 17th century. As Denmark needed a naval base in the central Baltic Sea, a fort was built on Christiansø and Frederiksø in 1684 which served as an outpost for the Danish Navy until 1855. The population peaked at the census in 1810 which showed 829 inhabitants. Many of the historical buildings now serve as living quarters for the local population, and some are rented, year after year, to regular summer residents. The islands' external appearance has changed very little in over 300 years. Girdled by thick granite walls with old cannons pointed seaward, Christiansø is a picturesque tourist spot seemingly frozen in time. A former part of the fort, Store Tårn on Christiansø has housed a lighthouse for the past 200 years, ^[1] and a small round tower on Frederiksø, Lille Tårn, serves as a museum.

The islands are state property and do not belong to either a municipality or a region, instead, they are governed by an administrator appointed by the Danish government. Major sources of income are fishery and tourism. There are 80,000 tourists per year, mostly day visitors arriving via Bornholm. Ertholmene is also a popular destination for yachts.