Ertholmene
| Fæstningen Christiansø | |
|---|---|
| Northeast of Bornholm, Denmark | |
 |
|
| Type | Naval fortress |
| Site information | |
| Controlled by | Denmark |
| Site history | |
| Built | 1684 |
| In use | 1684-1855 (1863) |
| Battles/wars | |
Ertholmene, generally called Christiansø, is a small archipelago situated approximately 18 km northeast of Bornholm in the Baltic Sea. Its permanent population is 92 (as of 2013[update]) and its area is 39 hectares (0.39 km2). Ertholmene belongs to Denmark and has the 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. Christiansø Church originally served the garrison. The population peaked at the census in 1810 which showed 829 inhabitants. They were soldiers and were there because of the Gunboat War. 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 has housed the Christiansø Lighthouse for the past 200 years, and a small round tower on Frederiksø, Lille Tårn, serves as a museum.
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