Archipelago Sea

Archipelago Sea

Archipelago Sea (Finnish "Saaristomeri", Swedish "Skärgårdshavet") is a part of the Baltic Sea between the Gulf of Bothnia, the Gulf of Finland and the Sea of Åland, within Finnish territorial waters. By some definitions it is the largest archipelago in the world by the number of islands, although the islands are very small and tightly clustered. The post-glacial rebound is relatively fast in the archipelago, causing noticeable changes within a lifetime.

The larger islands are inhabited and connected by ferries and bridges. The Åland Islands, including the largest islands of the region, form an autonomous region within Finland. The rest of the islands are part of Finland Proper. The Archipelago Sea is a significant tourist destination.

Geography and geology

The Archipelago Sea covers a roughly triangular area with the cities of Mariehamn, Uusikaupunki and Hanko at the corners.The area can be divided into inner and outer archipelagos, with the outer archipelago consisting mainly of smaller, uninhabited islands.

The archipelago has a very large number of islands. The exact number depends on the definition of the term "island", as the size of the patches of dry land in the area varies from small rocks peeking out of the water to large islands with several villages or even a small town. The number of the larger islands of over 1 km2 within the Archipelago Sea is 257, whilst the number of smaller isles of over 0,5 ha is about 18000. If the number of smallest uninhabitable rocks and skerries is accounted, 50 000 is probably a good estimate.Fact|date=August 2008 In comparison, the number of islands in Canadian Arctic Archipelago is 36 563.Fact|date=August 2008 Indonesia has 17 508 islands, according to the Indonesian Naval Hydro-Oceanographic Office. [ [] Geography of Indonesia at]

The islands began emerging from the sea shortly after the last ice age. Due to the post-glacial rebound the process is still going on, with new skerries and islands being slowly created and old ones enlarged or merged. The current rate of rebound is between 4 and 10 millimetres a year. [ [] The website of Finland's environmental administration] Because the islands are made of mainly granite and gneiss, two very hard types of rock, erosion is significantly slower than rebound. The sea area is shallow, with a mean depth of 23 m. Most of the channels are not navigable for large ships.

There are three crater-like formations in the archipelago. One of them, Lumparn in Åland, is a genuine impact crater. [ [] Lumparn in the Eart Impact Database] (coord|60|8|22|N|20|7|37|E) The two other formations are intrusions. The more prominent of these is the Åva Intrusion in the municipality of Brändö, which is easily notable in satellite photos and high-resolution maps. (coord|60|28|19|N|21|1|0|E) The other similar formation is in Fjälskär, between the main islands of Houtskär and Iniö. [ [] A study about the geology of the archipelago conducted by the Geological Survey of Finland] (coord|60|18|25|N|21|22|18|E)

Demographics and administration

:"See also: Åland Islands"

thumb|250px|right|Map_of_the_Sweden/Finland_Islands_Euroregion] The islands are divided between the province of Western Finland and the autonomous province of Åland. The border between the provinces runs roughly along Skiftet (Kihti in Finnish), a relatively open sea area. Together with the islands near the coast of Sweden the area forms a Euroregion. The main ports in the area are Turku on the continent, and Mariehamn on the Åland islands.

The Åland region is autonomous and demilitarized. It has its own regional parliament and has Swedish as its sole official language. The regional parliament has power over wide-ranging matters, including health services, education, environment, and postal services. Monetary and foreign policy are handled by the Parliament of Finland. The president of Finland has, in theory, right to veto the laws passed by the Åland regional parliament. [ [] The official pages of Åland]

The number of permanent residents on the islands is roughly 60,000, with 27,000 of them living in Åland. Also outside Åland most of the area has been more or less monolingually Swedish-speaking, now officially bilingual with a Swedish-speaking majority. The northern part of the area is monolingually Finnish.

Many Finns have summer residences on the islands in the area, known for its natural beauty. Due to this the population of many islands can double or more during the summer. Although having a summer cottage in the archipelago is more common among the Swedish-speaking, the Swedish-speaking are a small minority on the mainland, and so most summer residents are Finnish-speaking, in contrast to the permanent residents. Kultaranta, the official summer residence of the president of Finland is on the island of Luonnonmaa in Naantali. [ [] The summer residence of the president of Finland]

An interesting feature in the demographics in the archipelago is the number of twins. The tendency for non-identical twin births is partly hereditary, and the necessary genes are prevalent in the archipelago. In the 18th and 19th centuries the proportion of twin births were greater than anywhere in Europe, and enormously higher than in continental Finland. The reason for this was fishing. Fish is an excellent source of protein and unsaturated fat. It was also available even when crops failed. Hence having twins maximizes lifetime reproductive success. [Lummaa, Virpi et al. (1998) "Natural selection on human twinning". Nature 394, 533-534 (6 August 1998)]

The eastern part of the archipelago is defended by the Archipelago Sea Naval Command, which has its main base in Turku. The defence is based largely on naval mines and coastal artillery. [ [] The Archipelao Sea Naval Command (in Finnish)] Both are effective in the archipelago, where the dense clusters of islands severely limit the manoeuvrability of invading vessels. The autonomous region of Åland is demilitarised. The Finnish Defence Forces are not allowed to enter the area, and its residents are exempt from military service.

Economy and communications

The islands generally enjoy a high standard of living comparable to that of continental Finland. Fishing and fish processing are major industries. The archipelago is well-known for its Baltic herring and rainbow trout products. Agriculture is limited by the small size and rocky nature of the islands. However, the climate is more favourable than in continental Finland and some islands, particularly Rymättylä, are famous in the nearby continental areas for producing the first new potatoes of the summer. The significance of tourism to the economy of the islands is constantly increasing.

The islands communities on the "Finnish" side of "Skiftet" are linked by the Archipelago Ring Road, a chain of bridges and ferries. Islands lying farther away are linked by ferries, and in case of Åland, a small airport. The ferries are divided into two categories. The "yellow" ferries ("landsvägsfärja" or simply "färja" in Swedish, "lossi" in Finnish) are free of charge and operate on short routes between adjacent (large) islands. They are raft-like in construction. The "white" ferries ("förbindelsebåt" in Swedish, "yhteysalus" in Finnish) are ship-like and charge a small fee. They operate on longer routes covering several smaller or more distant islands. Large cruiseferries connect the Finnish cities of Turku and Helsinki to Åland and Sweden.

During cold winters official ice roads are established between some islands. Driving on the ice is common also to islands lacking official ice roads. This greatly eases transportation, as it makes it possible to simply drive a car (or even a heavy van if ice is very thick) from the continent to the islands. On the other hand, during spring and autumn there is a period of thaw ("menföre" in Swedish, "kelirikko" in Finnish) when the ice is too thin even for walking, but too thick for boating. This can leave some islands lacking a pier for large ships isolated for days or weeks.

Many important shipping lanes cross the Archipelago Sea. Navigation is made hazardous by the labyrinthine archipelago, varying depth and numerous skerries. For this reason the islands are dotted with lighthouses of varying sizes and navigational marks. Maritime pilot services are maintained by the state.


The culture of the archipelago resembles that of the Swedish-speaking coastal areas of Finland. Many features of typically Finnish culture, such as the popularity of sauna, have became ingrained in the culture of the islands. There are, however, several subtle differences. Maypoles are an essential part of the Midsummer festival in the archipelago but not in the continent. On the other hand, the continental Finnish Midsummer tradition of lighting bonfires has been introduced to the archipelago relatively recently.

Based on the languages spoken the archipelago can be divided into three parts. The Åland archipelago in the west is completely Swedish-speaking, the Åboland archipelago in the south is mostly Swedish-speaking and the northern archipelago is Finnish-speaking.

Because christianity spread to the islands before the mainland, the churches on the major islands tend to be old, dating from the 13th, 14th and 15th centuries, with the oldest ones in Åland. More than 80 % of Finns are members of the Evangelical Lutheran Church of Finland, and this proportion is even higher in the archipelago, as the area doesn't have an orthodox or catholic parish.

The culinary culture of the archipelago resembles continental Finnish cuisine. Naturally, there is a greater emphasis on fish, particularly baltic herring, salmon and rainbow trout. The island are also famous for traditional dark bread distinguished by the use of buttermilk, syrup, and malt among the ingredients. The main dish of the Christmas dinner is usually a northern pike. Every Christmas the fishermen of Korppoo deliver a pike for the president's table.

Nature and conservation

The islands provide a unique and diverse environment for wildlife. The bigger islands resemble the coastal regions of continental Finland whereas skerries have a radically different environment. Smaller islands are devoid of trees, but still harbour rich plantlife. The environment is sunny, has a relatively long growing season and is fertilised by guano. On the other hand, nearly constant wind and thin or non-existent soil limit plant growth. The very low salinity of the Baltic Sea makes splashes of seawater more benign for plantlife.

The conditions can vary radically even within one small island, due to the features of the rock on which the islands are based. [ [] Special characteristics of the archipelago nature at the website of the Archipelago Sea National Park (in Finnish)] There may be small patches of fresh-water bogs, ponds of fresh water, ponds of brackish water, bushes, meadows, barren rocks, wind-beaten shores and sheltered coves on an island only a few tens of meters in diameter. Many plants have altered phenotypes due to the environment. For example, junipers on small islands grow only to a height less than 0,5 metres, but can cover several square metres.

While most of the islands are rocky, some are actually extensions of the Salpausselkä ridge system, and thus composed of terminal morraine. Such islands include Örö and Jurmo. The flora and fauna in these islands is more diverse than in their rocky neighbours.

The islands are a haven for seabirds. The species include mute swan, black guillemot, great crested grebe and numerous species of sea gulls. Recently great cormorants have spread to the archipelago and their numbers are increasing. This not necessarily viewed as a good thing by nature lovers, since great cormorants live in dense colonies which will eventually poison surrounding plantlife by their excrement.

The greatest threat to the environment is eutrophication caused mainly by agriculture and fish farms. [ [] Article about eutrofication in the website of Finland's environmental administration] This has been partly brought under control in Finland, but the effects are masked by the general decline in the condition of the Baltic Sea. Many areas of the archipelago are protected from human activity by their sheer inaccessibility. The are also many small nature conservation areas and the Southwestern Archipelago National Park, where landing to some islands is restricted only to scientists. [ [] Main page of the Archipelago Sea National Park]


The islands began rising from the sea (at that stage called the Yoldia Sea) 10,000 years ago. The oldest archaeological finds in Dragsfjärd date back to ca. 4000 BC and represent the Pit-Comb Ware culture. During that period the outer archipelago was formed by the highest points of the main islands of Houtskari, Korppoo and Nauvo. Due to post-glacial rebound the entire archipelago has risen approximately 25 meters since, enlarging existing islands and creating many more.

During the 12th and 13th centuries Sweden established its control of the Archipelago Sea. At the same time christianity started to spread to Finland, starting from the archipelago and the adjacent coastal area. The islands occupy a strategic position, guarding the approaches to Stockholm, Turku and the entire Gulf of Bothnia. Therefore they were fortified by the Swedish empire during the Middle Ages. A royal postal route used to go via the northern islands in the 16th and 17th century. In 1809 Sweden was forced to cede the islands to Russia, and they became part of the Grand Duchy of Finland.

In 1808 the War of Finland broke out between Sweden and Russia. In April Russian troops occupied the archipelago, including Åland. Soon after the local residents, enraged by the confiscation of ships, rebelled. Aided by troops from Sweden the archipelago was cleared from Russian troops in May. The Swedish troops then used the islands as a staging area for the recapture of continental Finland. The archipelago remained in Swedish control until the end of the war, but in the subsequent Treaty of Fredrikshamn Sweden was forced to cede the area along with rest of Finland. The Archipelago Sea became part of the autonomous Grand Duchy of Finland under the Russian Empire.

During the Crimean war an Anglo-French force attacked and destroyed the Bomarsund castle. In the Åland convention of 1856 the Åland side of the archipelago was demilitarised. The area remains so even today.

Finland gained its independence from Russia in 1917. Shortly after, the Swedish speaking inhabitants of the Åland Islands, in the western part of the Archipelago, appealed to Sweden to annex the islands. The request received mixed support in Sweden, but led to the Åland crisis. The League of Nations was called in to resolve the situation, and in 1921 the League granted the sovereignty of the entire archipelago to Finland, despite the objections of the majority of Ålanders. However, Åland was given a wide autonomy, and its demilitarised status was reaffirmed.

In 1939 Soviet Union invaded Finland in the Winter War. At the end of the war in 1940 Finland was forced to rent Hanko at the eastern extreme of the Archipelago Sea to Soviet Union as a military base. In 1941 the War of Continuation broke out. Finland sent troops to Åland to guard against a possible Soviet invasion, which didn't materialize. Finnish army also laid siege on Hanko, which was evacuated by Soviet Union later that year. Finnish troops remained in Åland until the end of the war in 1944.

In 1995 Finland became a member of the European Union. The referendum on the membership was held separately in Åland, leading to the possibility of different outcomes. A rejection of the EU membership by the Ålanders would have created a situation similar to that of Greenland, which belongs to Denmark but is not part of the EU. However, the membership was accepted in both referendums.

Throughout its history the population of the Archipelago Sea has varied significanlty. The population increased until the first half of the 16th century. After that the population went into decline as the carrying capacity of the environment was reached and wars and pestilence took their toll on the people. In the 19th century the population increased sharply as new, more efficient fishing methods were introduced. In the 20th century the population went into decline again, especially on smaller islands, due to rapid urbanization. Many smaller islands became completely uninhabited. During the recent decades increasing number of summer residences in the archipelago have revitalized some areas. [ [] History of the archipelago at the website of the Archipelago Sea National Park (in Finnish)]

List of municipalities

Island municipalities in Finland Proper:

Coastal municipalities in Uusimaa which also include some islands:

The archipelago continues further to the east in Uusimaa, but Hanko is traditionally seen as a dividing point between the Archipelago Sea and the Gulf of Finland.

Image gallery

Nagu church dating from the 15th century

The_Isokari_lighthouse in Kustavi
Marina in Korpo

Hiittinen, 25 km west of Hanko]

Isokari_maritime pilot station, responsible for guiding ships to the harbour of Uusikaupunki.

External links

* [ Southwestern Archipelago National Park]
* [ Turku Archipelago]
* [ Steamship s/s Ukkopekka cruise Naantali-Turku]
* [ Interactive map of the ferries in Finland]
* [ All guest harbors in the Archipelago of Turku and Aland]


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