Navigation through the maze of the Archipelago Sea can be very dangerous, because of the changing depths and numerous rocks.
However, the underwater and the Archipelago passages are wonderful too, for people who look for adventures in the seas and islands.
Here, the scene is very beautiful and visitors will always be excited when they get through those sea passages.
This page covers the archipelago areas in brief. If you know more about this area in Finland or the surroundings, please use the form on this page to write about it. Thanks.
The archipelago is a part of the Baltic Sea and it consists of roughly 40,000 islands, if you count every rock that breaks the surface. This makes it the largest archipelago in the world.
However, only 257 of them measure more than one square kilometre and even fewer are inhabited. The large inhabited island is the Aland Island.
The islands broke out after the last ice age about 10,000 years ago. They are still in a postglacial rebound process, rising between 4 and 10 millimetres per year. The old islands become larger and the new small ones constantly emerge from the shallow water that has an average depth of only 23 meters.
In cold winter, the sea freezes over, making it possible to drive on ice, and there are constructed official ice roads to connect the islands.
For several hundred years, the fish was a vital source of food for the islanders. Seafood will be always available there, when the production of the crops fail.
Despite the growth of tourism today, fishing is still the primary source of income in the region. The area is particularly known for its Baltic herring and rainbow trout.
The Archipelago Sea is subjected to a process known as eutrophication. Eutrophication is usually caused by nutrient pollution from sewage effluent, or the run-off from fertilisers that stimulate algal growth in shallow, brackish water like the Archipelago Sea.
Besides making the water cloudy, the algal growth causes a lack of oxygen and reduces food quantity, affecting the health of fish species like salmon, trout and Baltic herring.
Although law biodiversity is registered, but there are also some species of mammals, rare Harbour porpoise, Grey seal, Ringed seal, and species of seabirds and other birds like cormorants, Caspian tern, Greater Scaup, White tailed Eagle in the areas of the Archipelago Sea.
Global climate change and the associated rising temperatures, decreasing ice cover and increasing winter rainfall, are expected to exacerbate eutrophication, with potentially damaging consequences for biodiversity, tourism and fishing in the Archipelago.
In this regard, some environmental organizations like Finland Regional Environment Centre have established works to stop the eutrophication of the Finish Archipelago Sea.
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