Bornholm (Danish pronunciation: [pɒːnˈhʌlˀm]) is a Danish island in the Baltic Sea, to the east of the rest of Denmark, south of Sweden, northeast of Germany and north of Poland.
Strategically located, Bornholm has been fought over for centuries. It has usually been ruled by Denmark, but also by Sweden and by Lübeck. The ruin of Hammershus, at the northwestern tip of the island, is the largest medieval fortress in northern Europe, testament to the importance of its location. Bornholm and Ertholmene comprise the last remaining Danish territory in Skåneland east of Øresund, having been surrendered to Sweden in 1658, but regained by Denmark in 1660 after a local revolt.
The island is known as solskinsøen ("sunshine island") because of its weather and klippeøen ("rock island") because of its geology, which consists of granite, except along the southern coast. The heat from the summer is stored in the rock formations and the weather is quite warm until October. As a result of the climate, a local variety of the common fig, known as Bornholm's Diamond (Bornholms Diamant) (Ficus carica 'Bornholm'), can grow locally on the island. The island's topography consists of dramatic rock formations in the north (unlike the rest of Denmark, which is mostly gentle rolling hills) sloping down towards pine and deciduous forests (greatly affected by storms in the 1950s), farmland in the middle and sandy beaches in the south.
The island is home to many of Denmark's round churches. Occupying an area of 584.59 square kilometres (225.71 sq mi), the island had a total population of 38,966 as of January 2025.
History
Medieval
In Old Norse the island was known as Borgundarholmr, and in ancient Danish especially the island's name was Borghandæholm or Burghændæholm; these names were related to Old Norse borg 'height' and bjarg/berg 'mountain, rock' because it is an island that rises high from the sea. Other names known for the island include Burgendaland (9th century), Hulmo / Holmus (Gesta Hammaburgensis ecclesiae pontificum), Burgundehulm (1145), and Borghandæholm (14th century). The Old English translation of Orosius uses the form Burgenda land. There are scholars who believe that the Burgundians are named after Bornholm. The Burgundians were a Germanic people who were settled in the Rhone region by the Romans, and who the region of Burgundy in France is named after.
Modern
Bornholm was pawned to Lübeck by Frederick I of Denmark for 50 years starting in 1525, in payment for its support in his acquisition of the Danish throne. Its first militia, Bornholms Milits, was formed in 1624. Swedish forces conquered the island during the Torstenson War in 1645, but returned the island to Denmark in the following peace settlement. After the war in 1658, Denmark ceded the island to Sweden under the Treaty of Roskilde along with the rest of the Skåneland, Bohuslän and Trøndelag, and it was occupied by Swedish forces.
A revolt broke out the same year, culminating in Villum Clausen's shooting of the Swedish commander Johan Printzensköld on 8 December 1658. After the revolt, the inhabitants handed back their island to the Danish kings.
Bornholm attracted many famous artists at the beginning of the 20th century, forming a group now known as the Bornholm school of painters. In addition to Oluf Høst, they include Karl Isaksson (1878–1922) from Sweden, and the Danes Edvard Weie (1879–1943), Olaf Rude (1886–1957), Niels Lergaard (1893–1982), and Kræsten Iversen (1886–1955).
World War II
In the early morning of 9 April 1940, German forces occupied Denmark and began the invasion of Norway (Operation Weserübung).
On 22 August 1942 a V-1 flying bomb crashed on Bornholm during a test – the warhead was a dummy made of concrete. The wreckage was photographed and sketched by the Danish Naval Officer-in-Charge on Bornholm, Lieutenant Commander Hasager Christiansen. When reported to British Intelligence, it was one of the first signs of Germany's aspirations to develop flying bombs and rockets, which were to become known as V-1. The Bornholm rocket turned out to be from Peenemünde.
The Soviet bombing of the two main towns on 7-8 May 1945 prepared the landing of Soviet troops at Bornholm.
Danish radio was not allowed to broadcast the news because it was thought it would spoil the liberation festivities in Denmark.
8 May 1945 was the Victory in Europe Day.
On 9 May, Soviet troops landed at Bornholm, and after a short fight, the German garrison (about 12,000 strong) surrendered. Soviet forces would leave the island on 5 April 1946.
Later research found that the Soviet bombing of Bornholm resulted in approximately three thousand Danish civilians in Rønne becoming homeless, while damaging a majority of the houses in Nexø, fully destroying roughly one-tenth. Ten Danes were killed and thirty-five wounded, considered a low number, because many civilians were evacuated to shelters on the outskirts of the respective towns before the worst raids hit. It was not until 5 April 1946, that Soviet troops finally left Bornholm. After the war, Bornholm received aid from Sweden to rebuild Rønne and Nexø.
Cold War
After the evacuation of their forces from Bornholm in 1946, the Soviet Union pressured Denmark not to allow non-Danish NATO troops to garrison the island. The Danish government never formally declared the island off-limits to foreign soldiers, but in practice the request was respected. During the Cold War, the island served as a radar base to monitor East Germany, Poland, and the Soviet Union.
On 5 March 1953, the day of Stalin's death, Polish pilot Franciszek Jarecki defected from the Eastern Bloc and landed a MiG-15 fighter on the island. He was later granted asylum and rewarded for providing Western intelligence with the then-newest Soviet jet fighter.
Since 1991
In June 2014, Russian military planes practiced a missile attack on the island according to the Danish intelligence service.
In 2017, Denmark's Defence Intelligence Service decided to build a listening tower near Østermarie, almost 90 meters high, to intercept radio communications across the Baltic Sea and in parts of Russia.
In September 2022, both Nord Stream gas pipelines were damaged by explosives close to the island.
Municipality
Bornholm Regional Municipality is the local authority (Danish, kommune) covering the entire island. Its formal name is Bornholm Municipality. It is the result of a merger of the five former (1 April 1970 until 2002) municipalities on the island (Allinge-Gudhjem, Hasle, Nexø, Rønne and Aakirkeby) and the former Bornholm County. Bornholm Regional Municipality was also a county in its own right between January 2003 until 31 December 2006. From 1 January 2007 all counties were abolished, and Bornholm became part of the Capital Region of Denmark whose main responsibility is the health service. In the bill (Danish forslag) (Bill of Law on merger of the municipalities of Bornholm) presented 30 January 2002 by the Minister of Interior and Health to Folketinget, it states that "The 1st of January 2003 Bornholm Municipality is established by a merger of (names of municipalities mentioned, and county's name mentioned), and (2nd sentence) Bornholm Municipality is called Bornholm Regional Municipality".
The island had 21 municipalities until March 1970, of which 6 were market towns and 15 parishes. In addition to supervising parish municipalities, which was the responsibility of the counties in all of Denmark, the market town municipalities of Bornholm were supervised by Bornholm County as well and not by the Interior Ministry as was the case in the rest of Denmark. The seat of the municipal council is the island's main town, Rønne. The voters decided to merge the county with the municipalities in a referendum 29 May 2001, effective from 1 January 2003. The question on the ballot was, "Do you want the six municipal entities of Bornholm to be joined to form one municipal entity as of 1 January 2003?" 73.9% voted in favour. The lowest percentage for the merger was in Nexø municipality (966 more people voting "Yes" than "No"), whose mayor, Annelise Molin, a Social Democrat, spoke out against the merger. It was required that each municipality had more "Yes" votes than "No" votes. Otherwise the merger would have to be abandoned altogether. The six municipal entities had up to 122 councillors (of which county clls were 18, from 1998 15), reduced to 89 in the municipalities from the 1990s, in the 1970s and the new regional municipality would have 27 councillors from the start 1 January 2003. They were reduced to 23 from 1 January 2018 (election November 2017). From 1 January 2003 until 31 December 2006 the 27 cllrs were called Regional Council (Danish Regionsråd), from 1 January 2007 changed to Municipal Board (Danish Kommunalbestyrelse) as is the usual term in almost all Danish municipalities. This was to avoid confusion with the Regional Council in Region Hovedstaden, and in the other regions
The merger was approved in a law by the Folketing 19 (and signature by the head of state 25) March 2002, transferring the tasks of the abolished county and old municipalities to the new Bornholm Regional Municipality. The first regional mayor in the first three years from 2003 until 2005 was Thomas Thors (born 28 July 1949), a physician and member of the Social Democrats and previously the last mayor of Rønne Municipality for five years from 1998 until 2002. He became a mayor again in 2021. Bjarne Kristiansen, who was the last mayor of Hasle 2+1⁄2 years from the summer of 2000 until 2002, representing the local Borgerlisten political party, served as mayor for four years from 1 January 2006 until 2009. From 1 January 2007, Bornholm became a part of the Capital Region of Denmark. From 1 January 2010 until 31 December 2020 the mayor was Winni Grosbøll, a high school teacher and a member of the Social Democrats (Socialdemokratiet) political party. The deputy mayor Morten Riis was mayor for a short interlude from 1 January until 4 January 2021. He is from the Red-Green Alliance. Thomas Thors, who was elected again in 2017, became mayor again from 4 January 2021. After the 2021 Danish local elections Jacob Trøst became mayor from January 2022. He is from the Conservative party. This was after an agreement (aftale om konstituering) between the Red-Green Alliance, amongst whom Morten Riis will be deputy mayor, and the Danish People's Party with the Conservatives.
Municipal council
Bornholm's municipal council today consists of 23 members, elected every four years. In the first four local elections in the newly created municipality there were 27 members elected to the municipal council. The 2002 local election only took place on Bornholm. From the election in 2017 the number of councillors elected was reduced to 23 members, serving their term of office from 1 January 2018 until 31 December 2021.
Below are the election results to the new merged municipal council beginning with the first election 29 May 2002.
Transport
Ferry services connect Rønne to Świnoujście (Poland), Sassnitz (Germany), Køge, 45 kilometres (28 miles) by road (34 kilometres or 21 miles as the crow flies) south of Copenhagen, Denmark; the destination to Køge replaced the nighttime route directly to and from Copenhagen (for both cargo and passengers) from 1 October 2004; and catamaran services to Ystad (Sweden). Simrishamn (Sweden) has a ferry connection during the summer. There are also regular catamaran services between Nexø and the Polish ports of Kołobrzeg, Łeba and Ustka. There are direct bus connections Ystad-Copenhagen, coordinated with the catamaran. There are also flights from Bornholm Airport to Copenhagen and other locations.
Because of its remote location Bornholm Regional Municipality has its own traffic company, BAT, and is its own employment region, and also performs other tasks normally carried out by the regions in the rest of Denmark. In some respects the municipality forms a region of its own.
Bornholm Regional Municipality was not merged with other municipalities on 1 January 2007 in the nationwide Municipal Reform of 2007.
Towns and villages
The larger towns on the island are located on the coast and have harbours. There is however one exception, centrally placed Aakirkeby, which was also the name of the municipality from 1970 until 2002, but it included the harbour of Boderne, 5 kilometres (3.1 miles) to the south. The largest town is Rønne; it is the seat, in the southwest on the westernmost point of the island. The other main towns (clockwise around the island) are Hasle, Sandvig, Allinge, Gudhjem, Svaneke and Nexø. Monday morning 22 September 2014 it was documented by Folkeregistret in the municipality that the number of people living in the municipality that day were 39,922, the lowest number in over 100 years.
As of 2018, Statistics Denmark gave the populations as follows: